Skip the bakery lines and forget boxed mixes—this homemade funfetti cake outshines anything store-bought. It features super moist, buttery vanilla cake layers made from scratch, packed with rainbow sprinkles, and finished with a simple, creamy vanilla buttercream.
I’m completely obsessed. After extensive testing, I believe no celebration is truly complete without this cake. If you want a colorful, nostalgic layer cake that tastes like a bakery version (not a boxed mix), this recipe is for you.
Not everyone is a cake person. If you prefer a smaller, handheld treat with the same birthday-cake flavor, try soft and chewy birthday cake cookies that also feature colorful sprinkles.
Table of Contents
Step by Step Instructions
1
Combine the dry ingredients and butter in a stand mixer bowl until the mixture looks like coarse sand. This reverse-creaming method helps produce a soft, tender crumb—mix just until the butter is evenly distributed into the flour.
2
Add half of the wet ingredients and mix until pasty. Scrape the bowl well after this step—dry ingredients often cling to the bottom and sides.
3
Mix in the remaining wet ingredients and the rainbow sprinkles. Finish mixing until you have a smooth, evenly colored batter with sprinkles distributed throughout.
4
Divide the batter among three 8-inch cake pans and bake. The layers are done when the edges are golden and a toothpick inserted into the center comes out with a few moist crumbs. Cool on a wire rack before frosting.
5
Prepare the vanilla buttercream. This simple frosting blends butter, powdered sugar, heavy cream, and real vanilla for the best flavor and texture.
6
Stack and frost the cake. Spread frosting between each layer, coat the outside with a thin crumb layer, chill briefly, and then finish with a final coat of buttercream. Garnish with extra sprinkles and serve.
3 Secrets to Getting That Boxed Mix Flavor
Unbleached cake flour: For a soft, tender crumb, cake flour is essential. It’s not interchangeable with all-purpose flour when using the reverse-creaming method—substituting will change texture and moisture.
Vanilla powder: Vanilla extract can lose some intensity during baking. Adding a small amount of vanilla powder or a concentrated vanilla product helps retain a bold, deep flavor in the cake itself.
Imitation vanilla for nostalgia: If you want the classic boxed-cake profile, imitation vanilla is the trick many bakers use. If you prefer a purer, more authentic taste, use pure vanilla paste or extract instead—especially in the frosting.
If you crave the funfetti vibe but prefer something denser, birthday-cake brownies are a great alternative—fudgy, studded with sprinkles, and easy to share.
If you try this recipe, please share how it turned out in the comments and leave a rating. I enjoy seeing your photos and feedback!
Homemade Funfetti Cake
Ingredients
Funfetti Cake Batter
- 2 1/3 cups unbleached cake flour *
- 1 1/2 cups granulated sugar
- 1 tablespoon baking powder
- 1 tablespoon vanilla powder
- 1 teaspoon fine sea salt
- 12 tablespoons cubed unsalted butter, room temperature
- 3 large eggs, room temperature
- 1/2 cup whole milk, room temperature
- 1/2 cup heavy cream, room temperature
- 1/2 cup sour cream, room temperature
- 1/4 cup vegetable oil
- 1 tablespoon imitation vanilla (or real vanilla if preferred)
- 1/3 cup rainbow jimmies sprinkles
Vanilla Buttercream Frosting
- 1 cup salted butter, room temperature
- 1 1/2 cups unsalted butter, room temperature
- 4 cups powdered sugar
- 3 tablespoons heavy cream
- 2 teaspoons pure vanilla bean paste or extract
Instructions
For the Cake Batter
- Preheat the oven to 325°F (160°C). Grease and flour three 8-inch cake pans and line the bottoms with parchment paper.
- Whisk together the cake flour, sugar, baking powder, vanilla powder, and salt in the stand mixer bowl.
- On low speed, mix in the cubed butter until the mixture looks sandy, about 2–3 minutes.
- In a separate bowl, whisk the eggs with the milk, heavy cream, sour cream, oil, and imitation (or real) vanilla.
- Add half of the wet ingredients to the dry mixture and beat until pasty and combined. Scrape the bowl, then add the remaining wet ingredients and the sprinkles. Mix until the batter is smooth.
- Divide the batter evenly among the prepared pans (about 475 g per pan). Bake 25–30 minutes, until edges are golden and a toothpick comes out with a few moist crumbs. Cool in pans 20–30 minutes, then turn out onto racks to finish cooling.
For the Frosting
- Beat both butters together on medium speed until light and fluffy, about 2–3 minutes.
- Add powdered sugar, pulse to combine, then beat on medium-high for 4–5 minutes until pale and fluffy.
- Add heavy cream and vanilla, mixing until just combined. Adjust consistency with more cream or sugar as needed.
Assembly
- Place the first cake layer on a serving platter. Spread an even layer of frosting, then add the second layer and repeat. Place the final layer on top, optionally upside down so the top is perfectly flat.
- Apply a thin crumb coat over the entire cake and refrigerate 20–30 minutes to set.
- Finish with a final coat of frosting, decorate as desired with extra sprinkles, and serve.
Notes
*Measure dry ingredients properly. Fluff the flour, spoon it into the measuring cup, and level—don’t scoop directly from the bag. Using a kitchen scale gives the most reliable results.
Do not substitute cake flour for this recipe. Using all-purpose will result in a drier, crumblier cake.
Vanilla tips: Imitation vanilla gives a classic boxed-cake flavor in the batter; use pure vanilla paste or extract in the frosting for a superior taste.
Storage: Store leftovers in an airtight container in the refrigerator for up to 5 days.
Freezing: Wrap whole cakes or individual slices tightly in plastic and freeze up to 1 month.
This recipe was created and tested by a real person
Trusted sources and tested techniques ensure this recipe delivers consistent, delicious results.