Small Batch Funfetti Cake

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There’s no flavor more celebratory than funfetti, so when I started recipe testing small batch cakes I knew I had to include a tiny funfetti cake! It’s extra soft and moist, packed with vanilla flavor, and studded with just the right amount of rainbow sprinkles. But what makes it extra FUN is its size! You can either make it as a mini layer cake or a single layer 6-inch cake, which makes the perfect amount for just 2-4 people. So whether you’re having a small get together, want to do something fun for date night, need a smash cake for a first birthday party, or simply want to make yourself a cake, this small batch funfetti cake recipe is perfectly sized to make any day feel like a party! 

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This small batch funfetti cake is essentially my small batch vanilla cake recipe with rainbow sprinkles folded in at the end. The mini vanilla cake recipe was such a success that there was no need to tweak anything to turn it into a funfetti flavor. There is one caveat to success with this recipe though: you have to use sprinkles that don’t bleed their color. I’ve had the best success with rainbow jimmies that are coated with confectioner’s glaze and/or carnauba wax. These ingredients help keep all the color contained in the baking process, and here are some tried-and-tested rainbow sprinkle brands from Amazon: 

• Sprinkle Pop Ultimate Unicorn Rainbow Jimmies
• Chef’s Select Rainbow Sprinkles
• Unpretentious Baker Rainbow Sprinkles

You can bake this small batch funfetti cake as a three layer 4-inch cake or a single layer 6-inch cake. I am absolutely obsessed with the mini layer cake version, and if you’re squealing with delight at the thought of making a tiny layer cake you’re gonna need a few 4-inch cake pans if you don’t already have them! The best part is that once you have a set of 4-inch pans, you can whip up any of my small batch recipes into tiny layer cakes. 

These mini funfetti cake layers are extra soft and moist with lots of credit to a couple key ingredients: cake flour and sour cream. While the sour cream makes this cake incredibly moist, the cake flour creates a soft and fluffy texture that locks in all that moisture. I love using cake flour in vanilla-based cakes because it creates a soft, fluffy cake more easily than all-purpose (or plain) flour due to its lower protein content (the more protein in your flour the stiffer the dough and less ability to maintain moisture).

Pro Tip: You can find cake flour in the baking aisle at most grocery stores, but if all you’ve got is all-purpose flour in your pantry, here are instructions for how to make your own cake flour in a pinch. 

To make things extra celebratory, I paired this mini funfetti cake with funfetti buttercream and let the sprinkles be the star of the show throughout. If you’d rather use a different frosting, you can pair this cake with pretty much any buttercream or frosting flavor imaginable. It goes with pretty much everything! Here are some alternative ideas: 

• Vanilla Buttercream
• Chocolate Buttercream
• Nutella Buttercream
• Blueberry Buttercream
• Strawberry Buttercream
• Raspberry Buttercream
• Lavender Buttercream
• Cream Cheese Buttercream
• White Chocolate Buttercream

UPDATE 2026: After some of your feedback, I revisited this recipe to make it more soft, fluffy, and fail-proof. The new recipe has the perfect amount of sprinkles (too many sprinkles made the old recipe crumbly) and the batter is slightly thicker to suspend those sprinkles more easily in the baking process. Enjoy!

I hope you love making this small batch vanilla cake recipe! Let me know who you made it for in the comments below + be sure to tag @sugarandsparrowco on Instagram to show me. I love to see what you create!