Gemma’s Best-Ever Chocolate Mug Cake

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Hi Bold Bakers!

WHY YOU’LL LOVE THIS RECIPE: My go-to Chocolate Mug Cake is the ultimate quick fix for a chocolate craving! This rich, soft, warm chocolate cake is ready in 6 minutes.

• No oven needed: This mini chocolate cake cooks quickly in the microwave, and you don’t have to heat up the kitchen—and clean-up is minimal.
• Simple ingredients: You probably already have everything you need on hand.
• Perfect single-serve dessert: You get exactly the amount of chocolate cake you want in a portion-controlled serving.
• Endless flavor variations: Mocha, peanut butter, caramel, Oreo and more.
• Absolutely delicious! Hundreds of reviewers agree—this cake has a soft, fudgy texture, deep cocoa flavor, and pockets of gooey chocolate.

When I first introduced mug cakes on Bigger Bolder Baking, I suspected home bakers would enjoy the convenience, but I was excited about just how wildly popular they became. I got it, though—even with my background in fine baking and classic pastry, I knew there was room for recipes that deliver instant homemade comfort in just minutes. This best Chocolate Mug Cake, inspired by our famous Best-Ever Chocolate Cake, is a perfect, cupcake-sized mug cake ready to eat in just a few minutes.

My top tip for you is to remember with this best mug case is that less is more! Stir just until the batter is smooth—overmixing can make the mug cake tough. And start checking for doneness at 45 seconds, since overbaking can quickly dry out a microwave cake. After you enjoy this mini chocolate cake, check out our other mug cake flavors, like Vanilla Mug Cake, Carrot Mug Cake, and Banana Mug Cake Bowl.

Bold Bakers Loved This!

“Oh. My. Word. So good! I can’t wait to make others soon.”—Heather

“Awesome recipe Gemma—it turned out to be perfect.—Anurupita

“Finally, a mug cake that comes out moist and delicious! Thank you for this recipe. My toddler and I loved making it.”—Zainab

“What a wonderful recipe. It rose beautifully and tasted amazing.”—Suzanne

IMPORTANT NOTE: This recipe was improved and updated on 5/22/2026, to include NEW mix-ins, flavor variations, answers to the most frequently asked questions and Pro Chef Tips. 

Table of Contents

• What is Chocolate Mug Cake?
• Tools You Need
• Key Ingredients
• How to Make Best-Ever Chocolate Mug Cake
• Gemma’s Pro Chef Tips
• Make Ahead & Storage Instructions
• Best Mix-ins for Chocolate Mug Cake
• FAQs (Flavor Variations and More!)
• More Mug Recipes

What is Chocolate Mug Cake?

Chocolate Mug Cake is a quick, single-serving cake made by mixing chocolate cake batter directly in a mug and steaming in the microwave until soft and fluffy. My mug cake delivers rich chocolate flavor, a fudgy texture, and gooey chocolate without needing a mixer or an oven.

Tools You Need

• Measuring spoons
• Measuring cup
• Glass measuring jug
• Microwave-safe large (12-14 oz.) mug
• Piping Bag with Nozzle (Optional)

Key Ingredients and Substitutes

All-purpose flour

• All-purpose flour provides structure to the cake by forming the base and giving it body.
• Substitute: You can substitute whole wheat flour for up to 50%of the all-purpose flour.
  • To make a gluten-free cake, you can use a gluten-free flour blend like our Easy Almond Flour Mix.

Granulated sugar

• Granulated sugar adds sweetness and helps to create a moist, tender cake.
• Substitute: You can use an equal amount of coconut sugar
  • You can also replace the 2 1/2 tablespoons of sugar with 1 1/2 tablespoons of honey or maple syrup, and reduce the amount of milk to 1 tablespoon plus 2 teaspoons to keep the batter from becoming too wet.

Unsweetened cocoa powder

• Unsweetened cocoa powder gives the cake its rich chocolate flavor.
• Substitute: You can use the same amount of Dutch-processed cocoa powder, all-natural cocoa powder, or cacao powder.

Baking powder

• Baking powder acts as a leavening agent, helping it rise, contributing to a fluffy texture.

Salt

• Salt enhances the easy mug cake’s flavors and balances the sweetness.

Egg

• The egg gives the chocolate cake structure, moisture, and richness.
• Substitute: You can replace the egg with 2 tablespoons of plain yogurt, preferably Greek yogurt or 2 tablespoons of applesauce.
  • Note that the mug cake may turn out slightly softer and denser, but will still be deliciously fudgy.

Milk

• Milk adds moisture and helps dissolve the dry ingredients to create a smooth batter and a tender crumb in the the cake in a mug chocolate.
• I recommend using whole milk for its rich flavor and creamy texture.
• Substitute: Use the same amount of non-fat milk, or a dairy-free milk such as coconut milk, almond milk, oat milk, cashew milk, or soy milk.

Vegetable oil

• Oil adds moisture and tenderness to this easy mug cake recipe, keeping it soft.
• Substitute: Use the same amount of coconut oil, avocado oil, or olive oil.

Chocolate chips

• • Chocolate chips provide pockets of melted chocolate throughout the cake, adding texture and richness.
  • Substitute: Use the same amount of chopped chocolate, peanut butter chips, or white chocolate chips if you prefer.

How to Make Best-Ever Chocolate Mug Cake

Make the batter

1. Mix dry ingredients: In a microwaveable mug mix together the flour, sugar, cocoa powder, baking powder, and salt with a fork.

2. Combine with wet ingredients: Add in the egg, milk, oil, and chocolate chips and whisk until you have a smooth cake batter.

Cook the batter

3. Microwave your cake for roughly 45 seconds, then check for doneness. The cake should have risen and be firm to the touch. If it is not done and still looks wet on top, cook for 10 seconds at a time and stop cooking just as soon as it is set. (Take care not to overbake or this will toughen the cake.)

• • Important note: The timing is based on our microwave which is 1200 WATTS. Check your microwave’s wattage, as your timing may vary. Some microwaves can take up to 2 minutes to cook this cake, but its better to go slow and keep checking.
  • Once cooked, top with a little fudge frosting, (pipe if on for pretty, decorative finish!), whipped cream Nutella, or a scoop of vanilla ice cream, some sprinkles, and enjoy!

FULL (PRINTABLE) RECIPE BELOW! 

Gemma’s Pro Tips

• Use a large mug. Be sure to use a large (12–14 oz) mug to prevent overflow while cooking. Note that the batter cooks very fast in a microwave, and it will overflow quickly if the mug is too small.
• Check your mug before cooking. Make sure your mug has no metal or metallic paint on it that will react in the microwave
• Accent with vanilla. If you like, add a few drops of vanilla extract for a mild, fragrant flavor.
• Blend gently. Take care not to overmix the mug cake, as this could make the texture tough.
• Do not overcook. If you’re wondering how to make cake in a cup with the best texture, when baking, the cake should be just set on top. Err on the side of caution with the cooking time and check after 45 seconds, because the cake will continue to cook after you take it out of the microwave.
• Wattage makes a difference. This recipe was tested in a 1100-watt microwave. Your cake may need less time or more time to cook, depending on your microwave.
• Want to make a cake for two? Try my Microwave Chocolate Lava Cake Bowl!
• Frosting tip. Next time you frost a cake, freeze any small amounts of leftover of frosting in an ice cube tray, then transfer to an airtight container. This way, you always have a little something to top your mug cakes with.
  • This method works well with my Chocolate Butter Cream Frosting, Peanut Butter Buttercream Frosting, Vanilla or Salted Caramel Buttercreams.

Make Ahead & Storage Instructions

Make-ahead tips

• Mix up the batter and refrigerate the batter for up to 48 hours.
• For even faster mixing, try this tip from Bigger Bolder Baking fan Colleen:  “I pre-measure snack baggies of the dry ingredients. Then, when we want a chocolate cake, I just add the egg and milk and microwave. That’s it—easy peasy!”

How to store leftovers

• Microwave mug cakes are best eaten once they have cooled from the microwave.
  • Store leftovers covered at room temperature for up to 24 hours.

What are The Best Mix-ins for Chocolate Mug Cake?

Here are some fun mix-in ideas to elevate your Chocolate Mug Cake:

• Nuts: Chopped walnuts, pecans, or almonds for added crunch.
• Dried Fruit: Raisins, dried cranberries, or chopped dried cherries for a fruity twist.
• Peanut Butter: Swirl in a spoonful of peanut butter or add peanut butter chips.
• Caramel: Add a few pieces of caramel candy or a swirl of caramel sauce.
• Spices: A pinch of cinnamon, nutmeg, or chili powder for extra flavor.
• Marshmallows: Mini marshmallows for a gooey, s’mores-like effect.
• Toffee Bits: For a sweet, crunchy texture.
• Mint: Crushed peppermint candies or mint chocolate chips for a refreshing taste.
• Coconut: Shredded coconut for a tropical touch.
• Oreos: Crushed Oreo cookies for a cookies-and-cream flavor.
• Instant Coffee: A pinch of instant coffee or espresso powder to enhance the chocolate flavor.
• Fruit: Fresh or frozen berries like raspberries, blueberries, or strawberries for a burst of freshness.

FAQs

Can I make this chocolate mug cake in the oven?

• Yes, you can make chocolate mug cake in the oven.
• Be sure to an oven-safe mug.
• Bake the mug cake at 350°F (180°C) for roughly 10 minutes.

Can I make this mug cake gluten-free?

• Yes, you can make this mug cake gluten-free.
• Simply use a 1:1 gluten-free baking mix, like my Easy Almond Flour Baking Mix, or another gluten-free flour in place of the all-purpose flour.

How can I make a vegan Chocolate Mug Cake?

To make a vegan version of Chocolate Mug Cake, make these swaps:

• Replace the egg with 2 tablespoons of unsweetened applesauce
• Instead of dairy milk, use any plant-based milk such as coconut milk, almond milk, oat milk, cashew milk, or soy milk.
• Use vegan chocolate chips.

What changes can I make to create a healthier version of this cake?

To create a lighter version of this cake, make these adjustments:

• Replace half of the all-purpose flour with whole wheat flour.
• Instead of granulated sugar, use the same amount of coconut sugar.
• Replace the dairy milk with a plant-based milk.
• Use dark chocolate chips for a less sweet option

What are other Chocolate Mug Cake flavor variations?

If you love this Chocolate Mug Cake, try my other chocolate mug cake varieties.

• Nutella Mug Cake
  • Just 3 ingredients!
• Red Velvet Mug Cake
  • luxurious and beautiful
• Hot Chocolate Mug Cake (Egg-Free)
  • Cocoa and marshmallow
• S’More Mug Cake
  • Fireside flavors in a mini-cake
• Chocolate Protein Mug Cake
  • Peanut butter and egg boots the protein content
• Chocolate Brownie in a Mug
  • Indulgent and fudgy
• Cookies and Cream Mug Cake
  • Chocolatey, creamy Oreo goodness
• Chocolate Peanut Butter Mug Cake
  • Nutty, cocoa flavor accented with brown sugar
• Molten Lava Mug Cake
  • Creamy center

More Mug Meals & Cakes Recipes

• Gemma’s Best-Ever Vanilla Mug Cake
• 1 Minute Microwave Brownie In A Mug
• Microwave Mug Pizza
• The Fastest Way to Make Banana Bread
• Microwave Jelly Donut in a Mug: Mugnut

IMPORTANT NOTE: This recipe was improved and updated on 5/22/2026, to include NEW mix-ins, flavor variations, answers to the most frequently asked questions and Pro Chef Tips. 

Make More Mug Meals!

Gemma's Best-Ever Vanilla Mug Cake

1 Minute Microwave Brownie In A Mug

Microwave Mug Pizza

1 Minute Microwave Mug Cakes

1 Minute Microwave Funfetti Mug Cake

1 Minute Microwave Mug Cakes: 5 Bold Flavors!

1 Minute Microwave Rainbow Mug Cake

1 Minute Mug Cookies: 3 Different Cookies Made in the Microwave

1 Minute Microwave Cheesecakes