Microwave Layer Cake

Craving a cheerful, bakery-style funfetti slice without turning on the oven? This incredibly soft Microwave Layer Cake uses a smart butter and oil trick to deliver party-perfect tiers in minutes.

Prep Time 15

Cook Time 10

Chilling time 30

Total Time 55

Equipment

Microwave
Microwave-safe silicone molds
large bowl
Whisk

Ingredients

Buttercream Frosting

▢ ⅔ cup sprinkles 90g

Instructions

Mix the Batter Until Silky

In a large bowl, whisk the all purpose flour, sugar, light brown sugar, baking powder, baking soda, and salt until the color looks even and you don’t see any brown sugar pockets. This quick whisk helps prevent bitter little hot spots of leavening in the microwave.
In a large microwave-safe bowl, melt the butter in the microwave until fully liquid and glossy. For the twist, hold back 2 tablespoons of that melted butter and replace it with a neutral oil, then stir so it looks like one smooth, golden pool.
In a separate jug, whisk the eggs, buttermilk, and vanilla extract until the mixture looks uniform and creamy, with no streaks of egg white sliding around.
Pour the buttermilk mixture into the dry ingredients and stir, then follow with the melted butter and oil mixture. Whisk thoroughly until the batter consistency is thick but satiny, and you can’t find any dry flour hiding on the bottom or sides of the bowl.
Fold in the sprinkles gently, just until they’re evenly scattered. Stop early rather than late, because overmixing makes the colors bleed and your funfetti cake turns dull and muddy.

Microwave the Layers One at a Time

Divide the batter evenly into three microwave-safe silicone molds, and smooth the tops so they’re as level as you can get them. A smooth surface helps the layers cook evenly and stack neatly later.
Microwave one layer at a time for 2 minutes and 30 seconds (based on a 1200W microwave). It’s done when the center feels firm to the touch and the cake is pulling away from the sides, and it should smell sweet and vanilla-forward, not eggy.
As soon as each layer comes out warm, brush it generously with a simple vanilla syrup so it soaks in instead of sitting on top. Let the layers cool completely before turning out, they set as they cool and release more cleanly.

Level, Crumb Coat, and Finish

Once the cakes are cool, level the tops if they look lumpy so the stack sits straight. Even a small trim makes the final layer cake look like it came from a bakery box.
Spread on a thin crumb coat of buttercream frosting, just enough to trap loose crumbs and create a smooth base. Chill for 30 minutes until the frosting feels set and slightly firm to the touch.
Finish with a thicker layer of buttercream frosting, then decorate as desired with sprinkles. Cover the cake and store at room temperature for up to 7 days.

Notes

Baking Strategy: Always microwave the layers one at a time. Baking multiple layers simultaneously leads to uneven cooking and patchy textures.

Smooth Batter Tip: Whisk the dry ingredients thoroughly before adding the sprinkles to prevent uneven hot spots and bitter leavening pockets during microwaving.

Avoid Sunken Centers: Do not open the microwave door too early, as this can collapse the delicate crumb structure. If your cake sinks, your microwave wattage might be lower, requiring slightly more time.

Nutrition information is estimated based on common ingredients and serving sizes and may vary.

Keyword funfetti cake, Microwave Layer Cake

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