Gluten Free Funfetti Birthday Cake

Today I’m sharing my recipe for gluten free funfetti birthday cake. It’s soft, fluffy, loaded with rainbow sprinkles, and tastes just as good as any traditional birthday cake.

Going gluten free doesn’t mean you have to skip out on a proper celebration cake. This one is easy to make and no one will even guess it’s gluten free.

The cake itself is light and tender with a hint of vanilla and almond flavor. It pairs perfectly with a simple buttercream frosting that comes together in minutes.

You don’t need any fancy ingredients or complicated steps here. Just basic pantry staples, a good gluten free flour blend, and some colorful sprinkles to make it fun.

Whether it’s for a birthday party or just because you feel like cake, this one is a winner every time.

Why You’ll Love This Recipe

The Frosting Is Unbelievably Fluffy – Whipping the butter for three full minutes before adding sugar creates an airy frosting that spreads like a dream.

Everyone at the Party Can Enjoy the Same Cake – You won’t need to bake a separate dessert because this tastes so good that gluten eaters will love it too.

Finally a Gluten Free Cake That Stays Moist – A full cup of butter in the batter plus whole milk keeps this cake soft and moist for days without crumbling apart.

Ingredients

For the Cake

• 2 1/2 cups Gluten Free All-Purpose Flour (with xanthan gum)
• 1 3/4 cups Granulated Sugar
• 1 tbsp Baking Powder
• 1/2 tsp Salt
• 1 cup Unsalted Butter, softened
• 4 large Egg Whites
• 1 cup Whole Milk
• 2 tsp Vanilla Extract
• 1 tsp Almond Extract
• 1/2 cup Gluten Free Rainbow Sprinkles

For the Frosting

• 1 cup Unsalted Butter, softened
• 4 cups Powdered Sugar
• 3 tbsp Heavy Cream
• 2 tsp Vanilla Extract
• 1/4 tsp Salt
• 1/2 cup Gluten Free Rainbow Sprinkles, for decorating

How to Make

Step 1

Preheat the oven to 350°F. Grease two 9-inch round cake pans, line the bottoms with parchment paper, then grease the parchment. Dust lightly with gluten free flour and tap out the excess.

Step 2

In a large bowl, whisk together the gluten free flour, granulated sugar, baking powder, and salt. Add the softened butter and beat with an electric mixer on medium speed for about 2 minutes until the mixture looks like coarse, sandy crumbs.

Step 3

In a separate bowl, whisk together the egg whites, milk, vanilla extract, and almond extract. Pour half of this wet mixture into the flour-butter crumbs and beat on medium speed for about 1 minute until smooth and fluffy.

Step 4

Add the remaining wet mixture and beat for 30 seconds more until just combined. Gently fold in the rainbow sprinkles with a spatula, being careful not to crush them or overmix.

Step 5

Divide the batter evenly between the two prepared pans and smooth the tops. Bake for 28 to 32 minutes, until a toothpick inserted in the center comes out clean and the edges just begin to pull away from the sides.

Step 6

Let the cakes cool in the pans for 10 minutes, then run a spatula around the edges and turn them out onto a wire rack. Peel off the parchment and let them cool completely before frosting.

Step 7

To make the frosting, beat the softened butter with an electric mixer on medium-high speed for 3 minutes until pale and creamy. Add the powdered sugar one cup at a time, beating on low speed after each addition until incorporated.

Step 8

Add the heavy cream, vanilla extract, and salt, then beat on medium-high for 2 to 3 minutes until the frosting is light, fluffy, and smooth.

Step 9

Place one cake layer on a serving plate and spread about 1 cup of frosting evenly on top. Set the second cake layer on top, then frost the top and sides with the remaining frosting using an offset spatula.

Step 10

Press gluten free rainbow sprinkles generously onto the sides of the cake and scatter more on top. Let the cake rest for 15 minutes before slicing so the frosting sets. Store covered at room temperature for up to 2 days.

My Tips

Use the Right Gluten Free Flour

Make sure your gluten free all-purpose flour blend already has xanthan gum in it. That’s what holds the cake together and gives it structure since there’s no gluten doing that job.

If your blend doesn’t have xanthan gum, add 1 teaspoon to the dry ingredients. Without it, the cake will crumble apart when you try to slice or frost it.

Bob’s Red Mill 1-to-1 and King Arthur Measure for Measure both have xanthan gum included and work well here.

The Butter-Flour Crumb Step Matters

When you beat the softened butter into the dry ingredients, you’re coating the flour in fat before any liquid touches it. This is called the reverse creaming method and it’s what gives the cake a tight, tender crumb instead of a coarse one.

Don’t rush this step. Beat for the full 2 minutes until the whole mixture looks like wet sand with no big chunks of butter left. If the butter is too cold, it won’t break down properly and you’ll get greasy pockets in the cake.

Your butter should be soft enough that you can press a finger into it easily, but it shouldn’t be melty or shiny.

Be Careful With the Sprinkles

Not all sprinkles are gluten free, even if they look the same. Brands like Sweets Indeed and Supernatural are safe options. Always check the label because some sprinkles contain wheat starch.

When you fold the sprinkles into the batter, use as few strokes as possible. If you stir too much, the colors bleed into the batter and you’ll get a grayish-purple tint instead of a clean white cake with colorful dots.

Also, use the classic rod-shaped jimmies, not nonpareils (the tiny round balls). Jimmies hold their color much better during baking.

More Tasty Recipes

• Gluten Free Classic Vanilla Layer Cake
• Gluten Free Soft Baked Funfetti Cookies
• Gluten Free Red Velvet Cupcakes
• Gluten Free Chocolate Cake
• Gluten Free Coconut Layer Cake

FAQ

Can I use a gluten free flour blend that doesn’t already have xanthan gum?

Yes, but you’ll need to add xanthan gum yourself. Use about 1 teaspoon for this recipe and whisk it into the dry ingredients before adding the butter. Xanthan gum is what helps hold the cake together and gives it that soft, springy texture that gluten free bakes often lack.

Without it, the cake layers will likely crumble apart when you try to frost them, so don’t skip it.