Lemon Blueberry Mug Cake

Lemon Blueberry Mug Cake is the kind of dessert that saves the day when a full cake feels unnecessary. It comes together in one mug, cooks in about a minute, and still delivers a soft, bakery-style crumb. Fresh lemon zest brightens the batter, while juicy blueberries create little pockets of jammy sweetness.

A spoonful of sour cream keeps the cake tender without adding an egg, so the texture stays light instead of rubbery. The batter is gently sweet, which lets the berries and lemon stand out. Better yet, the whole recipe uses simple pantry ingredients and requires no oven.

Serve it warm just as it is, or add a small spoonful of whipped cream or vanilla ice cream. It makes an easy afternoon treat, a quick summer dessert, or a cozy late-night sweet when only one serving is needed.

Recipe Yield: 1 serving

INGREDIENTS

4 tbsp all-purpose flour, leveled
3 tbsp fresh blueberries, divided
1 tbsp unsalted butter, melted
2 tbsp granulated sugar
1/4 tsp baking powder
1/8 tsp fine salt
1 tsp finely grated lemon zest
2 tbsp whole milk
1 tbsp sour cream
1 tsp fresh lemon juice
1/2 tsp vanilla extract

INSTRUCTIONS

1. Make the lemon sugar:
Add the sugar and lemon zest to a 12- to 14-oz microwave-safe mug. Press and stir them together with the back of a spoon until fragrant.

2. Mix the dry ingredients:
Add the flour, baking powder, and salt. Stir until evenly combined and no clumps remain.

3. Finish the batter:
Add the milk, sour cream, melted butter, lemon juice, and vanilla. Stir just until the batter looks smooth and no dry flour remains.

4. Add the blueberries:
Gently fold 2 tbsp blueberries into the batter. Scatter the remaining blueberries over the top without stirring them in.

5. Microwave the cake:
Microwave on high for 60 seconds. Then, continue cooking in 10-second bursts until the top and center are set and no wet batter remains, usually 70 to 90 seconds total. Avoid overcooking, since the cake will continue to firm as it rests.

6. Rest and serve:
Let the mug cake rest for 1 minute to finish setting. Serve warm directly from the mug.

HELPFUL TIPS TO PERFECT THIS RECIPE

• Choose a roomy mug: Use a 12- to 14-oz microwave-safe mug so the cake has enough room to rise without spilling over the sides.
• Stop cooking once the center sets: Microwave cakes become rubbery when overcooked. Remove the cake when the center no longer looks liquid, even if the surface remains slightly moist.
• Frozen blueberries work too: Add them directly from the freezer without thawing. The cake may need 10 to 20 additional seconds, depending on the microwave.
• Keep the lemon zest fine: Grate only the bright yellow peel. Larger pieces or white pith can create a bitter taste instead of clean lemon flavor.