This microwave chocolate cake is rich, soft, and full of chocolate flavor, with a warm, tender center that’s ready in just a few minutes.
When you want chocolate cake but don’t want to preheat the oven or make an entire layer cake, this easy microwave chocolate cake is the answer. Everything mixes right in a mug, and after about a minute in the microwave, you have a warm homemade dessert ready for a spoon.
Chocolate chips melt into the cake as it cooks, giving you little pockets of chocolate throughout every bite. I love how simple this recipe is. There’s no egg to measure, no mixer to pull out, and almost no cleanup afterward.
YOU’LL LOVE THIS EASY MICROWAVE CHOCOLATE CAKE
QUICK: From measuring the first spoonful of flour to taking your first warm bite, this dessert takes about five minutes.
SIMPLE INGREDIENTS: Flour, cocoa powder, sugar, milk, oil, and a few pantry basics make the entire cake.
SOFT TEXTURE: Using oil and milk keeps the cake moist instead of dry or rubbery.
SINGLE SERVING: You can make one chocolate cake without having a full-size dessert sitting on the counter afterward.
EASY CLEANUP: Mix and cook the batter in the same microwave-safe mug.
This is especially handy when a chocolate craving hits after dinner. The cake tastes best while it’s still slightly warm, when the chocolate chips are soft and the center has that freshly baked texture.
MICROWAVE CHOCOLATE CAKE INGREDIENTS
You’ll need:
- 4 tablespoons (30 grams) all-purpose flour
- 3 tablespoons (38 grams) granulated sugar
- 2 tablespoons (10 grams) unsweetened cocoa powder
- ¼ teaspoon baking powder
- ⅛ teaspoon salt
- 4 tablespoons (60 milliliters) whole milk
- 2 tablespoons (30 milliliters) vegetable oil
- ½ teaspoon vanilla extract
- 1 tablespoon (14 grams) semi-sweet chocolate chips
- 1 teaspoon semi-sweet chocolate chips for the top, optional
ALL-PURPOSE FLOUR
Regular all-purpose flour gives the cake enough structure to rise while keeping it tender.
Measure carefully. Scooping flour firmly into the measuring spoon can pack too much flour into the batter, and even a small amount makes a noticeable difference in a single-serving cake.
For the best measurement, gently stir the flour, spoon it into the tablespoon, and level the top.
UNSWEETENED COCOA POWDER
Cocoa provides the deep chocolate flavor without adding extra liquid.
Natural unsweetened cocoa powder works perfectly. Dutch-process cocoa can also be used and will give the cake a darker color with a smoother chocolate flavor.
Make sure you’re using unsweetened cocoa rather than hot chocolate mix. Hot cocoa mixes contain sugar and other ingredients that will change the texture.
GRANULATED SUGAR
Three tablespoons give this little cake enough sweetness to balance the cocoa powder without making it overly sugary.
If you prefer dark, bittersweet desserts, you can reduce the sugar slightly. Keep in mind that sugar also helps the cake stay soft.
BAKING POWDER
A small amount is all you need.
Because the batter cooks so quickly, baking powder gives it the lift needed to turn a thick chocolate batter into a soft little cake.
MILK
Whole milk gives the richest result, but several other types of milk will work.
The batter should look smooth and pourable once everything is combined. It shouldn’t resemble thick cookie dough.
VEGETABLE OIL
Oil is especially useful in microwave cakes because it remains liquid after cooking.
Butter tastes wonderful in traditional cakes, but a microwave can quickly turn a small butter-based cake dry when it cooks a few seconds too long. Vegetable oil keeps this version tender.
CHOCOLATE CHIPS
This ingredient is technically optional, but it makes a big difference.
The chips soften as the cake cooks and create melted chocolate spots inside. Sprinkle a few more over the batter before microwaving if you want the top to look extra chocolatey.
WHY THIS MICROWAVE CAKE DOESN’T NEED AN EGG
One of the easiest ways to end up with a rubbery mug cake is to add too much egg.
A whole egg is simply more than this small amount of batter needs. Traditional cakes can spread that egg across an entire pan of batter. In one mug, it can overpower the texture and make the finished dessert springy.
Milk provides moisture, while baking powder handles the rise. Oil supplies richness and keeps the crumb soft.
The result still tastes like cake. Just without having to divide an egg or save half of one for later.
MICROWAVE CHOCOLATE CAKE SUBSTITUTIONS AND ADDITIONS
MILK: Whole milk gives you a rich cake, but 2% milk works just as well. Unsweetened almond milk, oat milk, or soy milk can also be substituted.
OIL: Use canola oil, vegetable oil, or another mild-flavored oil. Melted coconut oil can be used, although it may add a light coconut taste.
CHOCOLATE CHIPS: Semi-sweet chocolate chips provide a nice balance with the sweet cake. Milk chocolate, dark chocolate, mini chocolate chips, or chopped chocolate will work too.
PEANUT BUTTER: Drop one teaspoon of creamy peanut butter into the middle of the batter before cooking. Don’t stir it in. It will create a soft peanut butter center.
COFFEE: Replace one tablespoon of the milk with cooled brewed coffee. Coffee deepens the cocoa flavor without making the dessert taste strongly like coffee.
EXTRA CHOCOLATE: Add one teaspoon of extra cocoa powder for a darker cake. You may need another teaspoon or two of milk if the batter becomes too thick.
VANILLA: Vanilla rounds out the chocolate flavor, but the recipe will still work if you don’t have any.
HOW TO MAKE MICROWAVE CHOCOLATE CAKE
Making cake in a microwave is fast, but those short cooking times mean small details matter. Use a large enough mug, stir the batter thoroughly, and start with less cooking time rather than more.
Here’s how you make it:
STEP ONE: CHOOSE YOUR MUG
Use a microwave-safe mug that holds at least 12 to 14 ounces.
The batter expands as it cooks. A small coffee cup may overflow before the center has time to finish.
A wider mug also cooks a little more evenly than a very tall, narrow one.
PRO TIP:
Place your mug on a microwave-safe plate before cooking. If the batter rises higher than expected, the plate makes cleanup much easier.
STEP TWO: MIX THE DRY INGREDIENTS
Add the flour, granulated sugar, cocoa powder, baking powder, and salt directly to the mug.
Stir with a fork until the cocoa is evenly distributed and you no longer see streaks of white flour.
Pay special attention to the bottom edge of the mug. Dry flour likes to collect there.
Breaking up the cocoa now also prevents little bitter pockets from appearing in the cooked cake.
STEP THREE: ADD THE WET INGREDIENTS
Pour in the milk, vegetable oil, and vanilla.
Stir gently until everything is combined.
Scrape your fork around the bottom and sides of the mug several times. Stop mixing once you have a smooth batter and there are no obvious dry areas.
A few tiny lumps are fine.
PRO TIP:
Don’t keep stirring after the batter is smooth. Too much mixing can make the texture firmer than you want.
STEP FOUR: ADD THE CHOCOLATE CHIPS
Stir one tablespoon of chocolate chips into the batter.
Sprinkle another teaspoon over the top if desired.
Some of the chocolate will sink into the cake while it cooks, while the pieces near the surface stay visible and turn soft and glossy.
STEP FIVE: MICROWAVE THE CAKE
Place the mug in the microwave.
For a microwave around 1000 watts, cook the cake on high for 60 seconds.
Check the center.
If you still see shiny, completely raw batter, microwave it for another 10 seconds. Check again and continue in short 5 to 10-second intervals if needed.
Most cakes will finish somewhere around 60 to 80 seconds in a 1000-watt microwave.
STEP SIX: LET IT REST
Leave the cake in the mug for about one minute before eating.
The mug will be hot, so remove it carefully.
During that short rest, the heat trapped inside continues cooking the center slightly. It also gives the crumb time to settle and become soft rather than wet.
Then grab a spoon and serve it warm.
HOW LONG TO MICROWAVE CHOCOLATE CAKE
Microwave wattage makes a big difference with a recipe this small.
A powerful microwave may finish the cake in less than a minute. A lower-powered model can need closer to 90 seconds.
For a 700 to 800-watt microwave, begin checking around 80 seconds.
For a 900 to 1000-watt microwave, begin checking at 60 seconds.
For an 1100 to 1200-watt microwave, begin checking around 50 to 55 seconds.
These are starting points rather than strict cooking times. The shape and material of your mug can change the timing too.
Short cooking intervals are your friend here. You can always add another 5 or 10 seconds. You can’t undo an overcooked mug cake.
HOW TO KNOW WHEN MICROWAVE CHOCOLATE CAKE IS DONE
The top should look mostly set rather than wet.
Touch it very lightly. It should feel soft and spring back a little.
A few moist crumbs are exactly what you want. If you keep microwaving until every part of the cake looks completely dry, the inside can become firm as it cools.
Don’t confuse melted chocolate chips with raw batter. Chocolate stays glossy even when the cake surrounding it is fully cooked.
OUR RECIPE DEVELOPER SAYS
Remove the cake a little earlier than you think you need to. The heat in the mug continues cooking it during the one-minute rest.
TROUBLESHOOTING MICROWAVE CHOCOLATE CAKE
WHY IS MY MICROWAVE CAKE RUBBERY?
It was probably cooked too long.
Because this cake is small, an extra 20 or 30 seconds can take it from moist to firm quickly.
Overmixing can also make the texture tougher. Stir just until the flour disappears.
WHY IS MY MUG CAKE DRY?
Too much flour or extra microwave time are the most common reasons.
Level each tablespoon of flour rather than packing it. Next time, reduce your microwave time by 10 seconds and check the center before cooking longer.
WHY DID MY CAKE OVERFLOW?
Your mug was likely too small.
Use a 12 to 14-ounce mug with enough empty space above the uncooked batter to allow it to rise.
WHY IS THE CENTER STILL WET?
Give the cake another 5 to 10 seconds in the microwave.
If the top looks cooked but the very center is still liquid, your mug may be tall and narrow. A wider microwave-safe mug usually cooks more evenly.
HOW TO SERVE MICROWAVE CHOCOLATE CAKE
This cake is delicious straight from the mug while it’s warm.
For an extra-rich dessert, add a scoop of vanilla ice cream. The cold ice cream begins melting into the warm chocolate cake and creates a creamy sauce around the edges.
Whipped cream is another easy option.
You could also add fresh raspberries, strawberries, sliced bananas, caramel sauce, chocolate sauce, powdered sugar, or a spoonful of peanut butter.
Want more texture? Sprinkle chopped pecans or walnuts over the top after cooking.
You don’t need a topping, though. With chocolate chips mixed into the batter, it has plenty of flavor all by itself.
HOW TO STORE MICROWAVE CHOCOLATE CAKE
MAKE AHEAD: You can combine the dry ingredients in your mug earlier in the day. Cover the mug and leave it at room temperature. Add the milk, oil, vanilla, and chocolate chips immediately before cooking.
IN THE FRIDGE: Microwave cake tastes best right after it is made. If you do have leftovers, cover the mug tightly and refrigerate for up to two days.
REHEATING: Microwave leftover cake for about 10 to 15 seconds, just until slightly warm. Heating it for too long will dry it out.
IN THE FREEZER: Freezing isn’t recommended for this recipe. Since a fresh cake takes only a few minutes to make, you’ll get a much better texture by mixing a new one.
MICROWAVE CHOCOLATE CAKE FAQS
Can I make chocolate cake in the microwave?
Yes. Microwave cake cooks from the moisture in a small amount of batter very quickly, which makes it perfect for a single-serving dessert.
Can I make this without chocolate chips?
Absolutely. The chocolate chips add melted pockets of chocolate, but the cocoa powder gives the cake plenty of chocolate flavor on its own.
Can I make microwave chocolate cake without an egg?
Yes. This recipe was designed without an egg. Milk, oil, and baking powder give the cake the moisture and lift it needs.
Can I use self-rising flour?
You can substitute four tablespoons of self-rising flour for the all-purpose flour, baking powder, and salt. Leave the baking powder and salt out if you make this swap.
Can I make two microwave cakes at once?
For the most consistent results, cook them separately.
Putting two mugs into the microwave changes how the energy is distributed and can increase the cooking time, leaving one cake more cooked than the other.
Can I bake this mug cake in the oven?
Yes. Make sure your mug is oven-safe, not simply microwave-safe.
Bake at 350°F for approximately 12 to 16 minutes, checking near the lower end of the cooking time.
Why does microwave cake cook so quickly?
A regular cake has a large amount of batter that must heat from the outside toward the center. This recipe contains only a few tablespoons of batter, so microwave energy can heat the moisture throughout it very quickly.
What size mug is best?
Use a microwave-safe mug with a capacity of at least 12 ounces. A 14-ounce mug gives you even more room for the batter to rise without spilling over.
This easy microwave chocolate cake is worth keeping nearby for those nights when one warm serving of dessert sounds better than baking a whole cake. Mix it, microwave it, give it that short one-minute rest, and eat it while the chocolate inside is still soft.
MICROWAVE CHOCOLATE CAKE RECIPE
Ingredients
- 4 tablespoons all-purpose flour
- 3 tablespoons granulated sugar
- 2 tablespoons unsweetened cocoa powder
- ¼ teaspoon baking powder
- ⅛ teaspoon salt
- 4 tablespoons whole milk
- 2 tablespoons vegetable oil
- ½ teaspoon vanilla extract
- 1 tablespoon semi-sweet chocolate chips
- 1 teaspoon semi-sweet chocolate chips for topping optional
Instructions
- Add the flour, sugar, cocoa powder, baking powder, and salt to a 12 to 14-ounce microwave-safe mug. Stir until evenly combined.
- Add the milk, vegetable oil, and vanilla extract. Stir until the batter is smooth and no dry flour remains at the bottom of the mug.
- Stir in one tablespoon of chocolate chips. Sprinkle another teaspoon over the top if desired.
- Microwave on high for 60 seconds in a 1000-watt microwave.
- Check the center. If you still see raw batter, continue cooking in 5 to 10-second intervals until the top is set but the cake is still soft.
- Let the cake rest for one minute before serving.
Notes
- Microwave wattages vary, so your exact cooking time may be different.
- Avoid overcooking the cake. A slightly moist center will continue cooking while the mug rests.
- Use a mug that holds at least 12 ounces to leave room for the batter to rise.
- For the most tender texture, measure the flour lightly and stop stirring once the batter is smooth.
