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Easy Marble Mug Cake

Alright, picture this: I’m at home craving something sweet, but I definitely don’t want to bake an entire cake (who does, honestly?). Enter the magic of the marble mug cake—a tiny, swirly delight that cooks right in your mug in just under two minutes. There’s something incredibly satisfying about watching those rich chocolate ribbons mix with the vanilla batter before the microwave works its charm. Trust me, it smells like heaven and the texture? Perfectly soft with a little gooeyness that hits the spot every time. Plus, the best part—you get your dessert without having to dirty a million dishes or wait forever. Ready to whip up your own little piece of sweet, chocolatey nostalgia?

Quick Facts

Yield: Serves 1
Prep Time: 5 minutes
Cook Time: 1-2 minutes
Total Time: 7 minutes

Ingredients

For the Main Dish:

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

How I Make It

Step 1:

Grab your favorite microwave-safe mug and mix together flour, sugar, baking powder, and salt until everything looks evenly combined.

Step 2:

Add in the milk, oil, and vanilla extract, stirring thoroughly to create a smooth batter with no lumps. This is your classic vanilla base.

Step 3:

Carefully spoon about half of the batter into a separate small bowl. Stir in the cocoa powder to that half to make your chocolate batter.

Step 4:

Back in your mug, dollop the chocolate batter on top of the vanilla one. Use a fork or a toothpick to gently swirl the two batters together. Don’t over-mix; you want those pretty marble streaks!

Step 5:

Pop your mug into the microwave and cook on high for about 90 seconds. Watch carefully—microwaves vary, so keep your eye out to avoid overcooking.

Step 6:

Let your cake cool for a minute or two (it’ll be super hot straight out of the microwave!). Then, grab a spoon, dig in, and savor that warm, swirled goodness!

Variations & Tips

Swap vegetable oil for melted butter for a richer flavor.
Add a pinch of cinnamon or instant coffee to chocolate batter to deepen the flavor.
Top with a scoop of vanilla ice cream or a drizzle of chocolate syrup.
For a fluffier texture, separate and beat an egg white, folding it into the batter before microwaving.
If your microwave is powerful, cook in 30-second bursts after the first minute to avoid dryness.
Use mini chocolate chips in the chocolate batter for extra melty pockets.

How I Like to Serve It

This mug cake is the perfect solo treat on a chilly evening, especially when paired with a cozy cup of tea or coffee. It also shines as a quick dessert after a busy weeknight dinner, no fancy plating needed. For a fun twist, serve alongside fresh berries or a dusting of powdered sugar to elevate the simple comforts into something a little more special.

Notes

If storing leftovers (if you have any!), cover the mug and refrigerate up to 24 hours; reheat gently in 20-second bursts.
You can swap all-purpose flour with gluten-free flour blends, but texture may be slightly different.

Closing: This easy marble mug cake is my go-to when I want a warm, cozy treat that’s quick, simple, and always perfectly satisfying.