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Peanut Butter Mug Cake

Alright, picture this: It’s late at night and you’re craving something sweet, but you don’t want to dive into a full pan of cake or dirty a dozen dishes. Enter the peanut butter mug cake – a tiny little miracle you can whip up in under five minutes, right in your microwave. The aroma of roasted peanuts mixed with warm vanilla fills your kitchen instantly, and the cake turns out insanely moist and fluffy, like a cozy little hug in a mug. I love how quick it is to make, and honestly, it’s one of those treats that feels totally indulgent but you only need one serving. Bonus? No fancy gadgets required!

Quick Facts

Yield: Serves 1
Prep Time: 3 minutes
Cook Time: 1 minute
Total Time: 4 minutes

Ingredients

For the Main Dish:

4 tbsp all-purpose flour
2 tbsp granulated sugar
1/4 tsp baking powder
Pinch of salt
3 tbsp peanut butter (creamy or chunky, your call!)
3 tbsp milk
1/2 tsp vanilla extract

How I Make It

Step 1:

First, grab a microwave-safe mug (10-12 oz is perfect) and add the flour, sugar, baking powder, and salt. Give it a quick stir to mix the dry ingredients evenly.

Step 2:

Next, stir in the peanut butter, milk, and vanilla extract. The batter will be thick and slightly sticky—that’s just how peanut butter does its magic. Make sure to combine everything thoroughly so no dry patches remain.

Step 3:

Pop your mug into the microwave and cook on high for about 60 seconds. Keep an eye on it—the cake should rise nicely and feel set on top but still moist inside. If it looks wet, add 10-15 seconds more; microwave times vary!

Step 4:

Let the mug cake rest for a minute or two after microwaving; this helps it finish cooking and cool slightly.

Step 5:

If you want to go all out, top with a spoonful of chocolate chips, a drizzle of honey, or even a scoop of vanilla ice cream for a dreamy finish.

Variations & Tips

Swap half the flour for whole wheat for a nuttier, heartier bite.
Use almond or cashew butter instead of peanut butter for a different nut twist.
Add 1 tbsp cocoa powder for a peanut butter chocolate version.
If your batter feels too thick, add a splash more milk for better mixing.
Microwave wattages vary—start with 60 seconds and adjust to avoid overcooking.
Stir the batter halfway through mixing if peanut butter is chunky to distribute it evenly.

How I Like to Serve It

This mug cake makes the best solo treat for a cozy night in or a quick afternoon pick-me-up. It’s perfect with a big cup of coffee or cold glass of milk. When guests drop by unexpectedly, this speedy dessert always feels like a fun little surprise—best enjoyed still warm and slightly gooey.

Notes

Store leftover cake in an airtight container in the fridge for up to 2 days; reheat briefly in the microwave.
For a vegan twist, use plant-based milk and peanut butter without added dairy.

Closing: This peanut butter mug cake is my go-to when I want a cozy, sweet fix without the fuss—simple, satisfying, and absolutely delicious every time.