Microwave Oven Cake Recipe

This microwave oven cake recipe delivers fluffy, moist layers in minutes. A retro-inspired treat with buttercream frosting and rainbow sprinkles perfect for birthdays, last-minute desserts, or quick celebrations.

Prep time

10 minutes

Cook time

15 minutes

Total time

25 minutes

Yield

10 servings

Ingredients

Cake Layers:

1 cup unsalted butter, melted and cooled

2 cups sugar

2 large eggs

2 cups whole milk

1 tbsp vanilla extract

3 cups all-purpose flour

2 tsp baking powder

1/2 tsp baking soda

1/2 tsp salt

Buttercream Frosting:

1 1/2 cups unsalted butter, room temperature

6 cups powdered sugar

1/3 cup whole milk

1 tsp vanilla extract

Rainbow sprinkles

Instructions

1. Step 1: In a large bowl, whisk together melted butter, sugar, eggs, milk, and vanilla extract until smooth and combined.
2. Step 2: Sift in flour, baking powder, baking soda, and salt. Gently fold until no dry streaks remain do not overmix.
3. Step 3: Divide batter evenly among three microwave-safe silicone pans.
4. Step 4: Microwave each layer individually for about 3 minutes and 15 seconds. Check with a toothpick; if it comes out clean, it’s ready.
5. Step 5: Let the cakes cool completely before frosting.
6. Step 6: To make frosting, beat softened butter in a mixer until creamy. Add powdered sugar gradually with milk and vanilla. Whip until light and fluffy.
7. Step 7: Stack and frost the cooled cake layers, then coat the exterior with remaining frosting.
8. Step 8: Decorate with rainbow sprinkles and enjoy your instant homemade cake!

Notes

Microwave time may vary slightly depending on your oven model start checking at 3 minutes.

Always cool cakes fully before frosting to prevent melting.

Cakes stay fresh, covered at room temperature, for up to 4 days.

For chocolate variation, replace 1/2 cup flour with cocoa powder.