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Quick Marble Mug Cake

Alright, I have to admit something: mug cakes used to seem like a bit of kitchen magic or wizardry to me. But once I cracked the code on this quick marble mug cake, I was hooked! Imagine swirls of rich chocolate and fluffy vanilla coming together in a cozy little cake that’s ready in less time than it takes to binge one episode of your favorite show. It’s soft, warm, and seriously satisfying—perfect for that sudden sweet craving. Plus, it’s a total lifesaver when you want dessert but don’t want to mess up your whole kitchen or wait forever. Grab a mug, and let’s turn your microwave into your new favorite dessert spot!

Quick Facts

Yield: Serves 1
Prep Time: 5 minutes
Cook Time: 1 minute 30 seconds
Total Time: 6 minutes 30 seconds

Ingredients

For the Main Dish:

4 tbsp all-purpose flour
2 tbsp granulated sugar
1/4 tsp baking powder
2 tbsp milk
1 tbsp vegetable oil (or melted butter)
1/4 tsp vanilla extract
1 tbsp cocoa powder

How I Make It

Step 1:

In a microwave-safe mug, combine the flour, sugar, and baking powder. Give it a quick stir to make sure everything’s evenly mixed — no lumps!

Step 2:

Add the milk, vegetable oil, and vanilla extract to the dry mix. Stir until you get a smooth batter, but don’t over mix — little bubbles of air will help keep it light and fluffy.

Step 3:

Now, spoon about half the batter into a separate bowl. Stir the cocoa powder into that half to create your chocolate batter.

Step 4:

Pour dollops of both vanilla and chocolate batter into the mug, layering or alternating. Use a knife or skewer to swirl the two batters together — just enough to make those pretty marbled patterns. Don’t overdo it!

Step 5:

Pop the mug into the microwave and cook on high for about 1 minute and 30 seconds. Keep an eye on it so it doesn’t overflow — microwaves vary, so you might need to adjust time slightly.

Step 6:

Let your cake rest for a minute (it’ll keep cooking a little as it cools), then dive right in with a spoon. Enjoy first bites of warm, tender cake with that perfect balance of chocolate and vanilla.

Variations & Tips

Swap milk for almond or oat milk for a different twist.
Add a pinch of cinnamon or espresso powder to enhance the chocolate flavor.
Stir in mini chocolate chips or chopped nuts before microwaving for extra texture.
Try topping with a dollop of whipped cream or a drizzle of caramel sauce.
If the cake is too dry, add a splash more milk next time.
For a fudgier center, place a small square of chocolate in the batter before microwaving.

How I Like to Serve It

This mug cake shines as a midnight snack or a quick afternoon pick-me-up. On chilly days, I love pairing it with a steaming mug of coffee or tea to add warmth and comfort. For an extra indulgent treat, serving it topped with a scoop of vanilla ice cream never fails to impress!

Notes

Store leftover batter in the fridge up to 24 hours (if you’ve made extra). Fresh is best for mug cakes though!
Reheat leftover mug cake in the microwave for 15-20 seconds if you want it warm again.

Closing: This quick marble mug cake never fails to bring a cozy moment of happiness, especially when you want something sweet in a flash.