This Chocolate Berry Mug Cake is a fast and simple way to satisfy a chocolate craving. A sweet, juicy berry sauce forms the bottom layer (use fresh or frozen berries), and a rich, fudgy chocolate cake bakes on top. Ready in about 10 minutes, it’s an ideal single-serving dessert.
Note: this recipe was originally published in 2020 and updated in 2021 with new photos and clarified instructions.
When you want a special dessert without a lot of leftovers, a mug cake is perfect. This Chocolate Berry Mug Cake is one of the best: fudgy chocolate cake studded with chocolate chips and a tangy-sweet berry sauce waiting at the bottom of the mug. It uses mostly pantry staples and frozen berries, so you can make it any time of year without advance planning.
If you enjoy mug cakes, try variations such as snickerdoodle, apple cinnamon, or strawberry shortcake mug cakes for different flavors and textures.
Recipe ingredients
Ingredient notes
- Frozen berries: use a single type or a mix. Cut large strawberries into bite-sized pieces. See the FAQs below if you want to use fresh berries.
- Oil: any neutral, light oil works (vegetable or canola).
- Milk: any milk is fine—2% or whole milk both work well.
- Chocolate chips: these add to the fudgy texture—dark chocolate chips are a great choice. Chopped chocolate can be substituted if needed.
Step-by-step photos
1. Add frozen berries, ½ teaspoon flour, and 2 teaspoons sugar to a microwave-safe mug. The small amount of flour helps thicken the berry sauce. Stir until there are no dry pockets of flour or sugar.
Keep stirring the berry, sugar and flour mixture until no dry pockets of flour and sugar remain.
2. Cover the mug with a folded paper towel and microwave for about 45 seconds, until the berries are warm and juicy. Stir again.
3. In a small bowl, combine the remaining dry ingredients (flour, cocoa, baking powder, sugar, pinch of salt). A small whisk or fork works well for mixing.
4. Add milk and oil to the dry ingredients and whisk until most lumps are gone. Stir in the chocolate chips.
5. Pour the cake batter gently over the berries—do not stir. This helps keep the berries anchored to the bottom.
6. Cover the mug again with a folded paper towel and microwave on high for about 90 seconds. The cake is done when the top is firm and no wet batter remains on the top or sides. If needed, microwave in additional 10-second increments until fully cooked.
7. If you greased the mug, you can unmold the cake onto a plate or bowl. Otherwise, enjoy it straight from the mug.
Tips and tricks
- If you want to unmold the cake, spray the inside of the mug with non-stick spray or grease it with oil or butter before adding the berries. Run a knife or toothpick around the edge after baking to help release the cake.
- Mix the flour and sugar into the berries thoroughly before microwaving. Any pockets of dry flour will affect the texture of the berry sauce—mix until everything is evenly moistened.
- Pour the batter slowly and gently over the berries to keep them at the bottom of the mug for a neat presentation if you plan to unmold the cake.
Recipe FAQs
Yes. Fresh berries will work, but they usually produce less sauce than frozen berries after microwaving. To encourage a saucy texture, lightly press a few fresh berries when mixing them with the small amount of flour and sugar so some juice is released. Microwave fresh berries for about 30 seconds instead of 45, then proceed with the recipe.
What are the best kinds of berries to use?
A mix of raspberries, blackberries, and blueberries gives deep flavor and juiciness. Strawberries also work—just chop large berries into bite-sized pieces first.
How do I keep the mug cake from overflowing?
Because the berries add liquid, place a folded paper towel over the mug to catch any spatter and use a microwave-safe mug that holds at least 12 ounces (355 ml). For extra protection, set the mug on a microwave-safe plate to catch drips.
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If you try this recipe, please leave a star rating or a review in the comments below—I’d love to hear how it turned out. Share photos on social media and tag @nibbleanddine if you like.
📖 Recipe
Chocolate Berry Mug Cake
Use frozen berries and a few pantry staples to make a single-serving, rich and fudgy chocolate cake with a tangy berry sauce at the bottom.
- Author: Kate
- Prep Time: 7 minutes
- Cook Time: 3 minutes
- Total Time: 10 minutes
- Yield: 1 serving
- Category: dessert
- Method: microwave
- Cuisine: American
Ingredients
- ¼ cup (37 g) plus ½ teaspoon all-purpose flour, divided
- 2 tablespoons (27 g) plus 2 teaspoons (9 g) granulated sugar, divided
- ½ cup (70 g) frozen berries (or fresh—see notes)
- 1 tablespoon cocoa powder
- ¼ teaspoon baking powder
- Pinch of salt
- 5 tablespoons (74 ml) milk
- 1 tablespoon (15 ml) neutral oil (canola or vegetable)
- 2 tablespoons (28 g) chocolate chips (any kind)
Instructions
- Optional: spray the inside of the mug with non-stick spray or lightly grease with oil or butter if you want to unmold the cake.
- In a large microwave-safe mug, add the frozen berries, ½ teaspoon flour, and 2 teaspoons sugar. If using strawberries, cut large pieces into bite-sized pieces first. Stir thoroughly so there are no dry pockets.
- Cover the mug with a folded paper towel and microwave on high for 45 seconds, until the berries are juicy and warm. Stir and set aside.
- In a small bowl, combine the remaining ¼ cup flour, remaining sugar, baking powder, cocoa powder, and a pinch of salt.
- Add the milk and oil to the dry ingredients and whisk until mostly smooth. Stir in the chocolate chips.
- Slowly pour the batter over the berry mixture without stirring. Replace the paper towel and microwave on high for 90 seconds. If the top still shows wet batter, microwave in 10-second increments until cooked through. Be careful not to mistake a melted chocolate chip for wet batter.
- Unmold the cake onto a plate or enjoy directly from the mug.
Notes
Fresh berries can replace frozen berries. When using fresh, lightly press a few berries to release juice when mixing with the flour and sugar, and microwave for 30 seconds instead of 45. Use a microwave-safe mug that holds at least 12 ounces (355 ml) to avoid overflow; place the mug on a plate for extra protection.
To check doneness along the sides, tilt the mug and run a knife between the cake and the mug to see if any batter remains.
Nutrition (estimate)
- Serving Size: 1 mug cake
- Calories: 555
- Sugar: 52.6 g
- Sodium: 194 mg
- Fat: 20.9 g
- Saturated Fat: 5 g
- Carbohydrates: 90 g
- Fiber: 5.1 g
- Protein: 8.8 g
- Cholesterol: 6 mg
Serving suggestion: top the finished mug cake with a small scoop of ice cream or a dollop of whipped cream, or simply enjoy it warm straight from the mug for a cozy, single-serve dessert.