This Chocolate Mug Cake hits the spot when you need a chocolate fix

This microwave Chocolate Mug Cake actually tastes like cake, and since I first posted this recipe in 2012, I’ve made it more times than I care to admit. It’s not too sweet (though you can play around with the sugar content if you have a sweet tooth!), it’s the perfect small size, and there’s no egg involved.

It’s simple, quick, and hits the spot when you need a little chocolate fix. 😋 All recipes are rigorously tested in our Nashville Test Kitchen to ensure they are easy, affordable, and delicious. “I’ve tried so many mug cakes, and this is the only one I keep coming back to.

It’s also absolutely wonderful with a tiny scoop of vanilla ice cream on top!”

A Cozy Chocolate Cake for One

What makes this chocolate mug cake work so well is the balance of moisture, fat, and microwave time.

Microwave cakes don’t brown or bake the same way oven cakes do, so the batter needs enough richness to stay soft without turning dense. I use milk and oil for tenderness, and the short cook time keeps the texture closer to a spoonable cake instead of something dry around the edges! But my favorite part of this chocolate mug cake recipe is the gooey surprise hiding in the center.

I always add a spoonful of peanut butter before microwaving, and it melts into this warm, creamy pocket that makes the whole cake feel extra indulgent. Don’t be tempted to leave out the peanut butter (or jam, or whatever you drop in the center…I’ve shared some fun variations below!) because it helps keep the cake moist and rich. It simply wouldn’t be the same without it.

Recipe Success Tips

• Don’t overcook it! Mug cakes can turn rubbery when they’re microwaved for too long. The top should look set but still soft, not dry or firm all the way through. If your microwave is higher than 1000 watts, start checking around 50 seconds and continue in short bursts as needed. Lower-powered microwaves may need an extra 10-20 seconds to cook through properly.
• Use fresh baking powder. If you’re not sure your baking powder is fresh, test it before starting so you don’t end up with a dense, flat cake. Add a small spoonful to hot water. If it bubbles right away, it’s active; if it barely fizzes, replace it. Fresh baking powder helps this chocolate mug cake stay light and cake-like.
• Don’t skip the center filling. Peanut butter is my go-to because it melts into a warm, creamy pocket, but crunchy peanut butter adds a little texture if you like a nutty finish. You can also swap in Nutella, jam, marshmallow fluff, caramel sauce, or cookie butter. The filling helps keep the center moist and makes the mug cake feel more indulgent.
• Add extra mix-ins for flavor. Stir in a few chocolate chips if you want an even richer, fudgier mug cake, or add a small splash of vanilla extract to round out the chocolate flavor (optional, but delicious if you’ve got it!)
• Make it dairy-free or vegan. Use your favorite plant-based milk to make this dairy-free and vegan.
• Make it gluten-free. Swap the all-purpose flour for a 1:1 gluten-free flour blend if needed. The texture may vary slightly with gluten-free flour, but several readers have had success with this swap (we love the King Arthur Measure for Measure gluten-free flour best).
• Double the recipe. Some readers have had success doubling it, but the cook time will need adjusting. Start by adding 15-30 seconds, then continue in short bursts until the cake looks set but still soft. Make sure to use a big enough mug so it doesn’t overflow!

How to Make a Chocolate Mug Cake Step-By-Step Photos

Gather all of your ingredients.

Combine the dry ingredients: Add 2 Tbsp flour, 1 Tbsp unsweetened cocoa powder, 2 tsp sugar, ¼ tsp baking powder, and a pinch of salt to a microwave-safe mug. Stir really well, making sure no streaks of cocoa powder or baking powder are hiding at the bottom.

This helps the cake rise evenly and keeps any bitter pockets of dry cocoa from sneaking in. Add the wet ingredients: Add 2 Tbsp milk and 1 Tbsp oil, then stir until a smooth, glossy batter forms.

Scrape around the bottom edge of the mug as you mix so there aren’t any dry patches left behind. Then drop a dollop of peanut butter, about 1 Tbsp, right into the center of the batter.

No need to stir it in! It’ll sink slightly as the cake cooks and create a warm and melty center.

Cook: Microwave on high for about one minute, or until the top looks set but still soft. Lower wattage microwaves (less than 1000W) may need an extra 10-15 seconds.

The cake should puff up around the peanut butter as it cooks, leaving you with a light, tender cake and a gooey peanut butter center. So magical! You get soft, light cake with a gooey ribbon of melty peanut butter running through the center.

Absolutely perfect.

Serving Suggestions

I’ve had this chocolate mug cake up on the blog for quite some time now, and as always, I love seeing how readers make this recipe their own.

There are SO many fun ways to dress it up a little, depending on what you’re in the mood for! If you want to keep it classic, add a small scoop of vanilla ice cream or strawberry ice cream on top while the cake is still warm so it melts down into all those soft, chocolatey edges. For something richer, add a spoonful of Nutella or another chocolate-nut spread on top and let the heat from the cake soften it!

I also think fresh berries are great to balance the rich chocolate. You can even drizzle on our cherry sauce for a Black Forest-style finish or strawberry syrup for extra fruity sweetness.

And when I want to keep it super simple, a little powdered sugar makes it look cute with almost no effort!