I appreciate how this cake delivers the perfect balance of fluffy cake and sweet, creamy frosting in every bite. The layers stay moist and tender, while the frosting adds just enough richness without overwhelming the cake.
I also love how fun it is to create the colorful layers. Separating and tinting the batter gives me the chance to be creative, and the final reveal when slicing into the cake always feels rewarding. It’s a wonderful centerpiece for celebrations and gatherings.
Ingredients
(Note: All ingredient amounts are listed in the recipe card below.)
Cake Ingredients 1 cup butter softened 2 cups sugar 2 teaspoons vanilla extract 6 large egg whites 3 cups all-purpose flour 4 teaspoons baking powder 1 teaspoon salt 1 cup milk food coloring red, orange, yellow, green, and blue cooking spray
Frosting Ingredients ½ cup butter softened 4 cups powdered sugar 1 teaspoon vanilla 2-3 tablespoon milk Sprinkles of your choice
Directions
I start by getting out and measuring all of my ingredients so everything is ready.
Cake Directions
I preheat my oven to 350ºF.
In a large mixing bowl, I cream together the butter and sugar until light and fluffy. I add the vanilla and egg whites, then beat again until smooth.
Next, I add the flour, baking powder, and salt, mixing until combined. I pour in the milk and beat again until the batter is smooth.
I divide the batter evenly into 5 separate bowls. I add one color of food coloring to each bowl—red, orange, yellow, green, and blue—stirring until the color is even throughout.
I prepare my 8-inch round cake pans by coating them with cooking spray and a thin layer of flour, tapping out any excess. I transfer each colored batter into its own prepared pan.
I bake each layer for 15 minutes, or until a toothpick inserted into the center comes out clean.
Once baked, I allow the cakes to cool in their pans for 15 minutes. I carefully run a knife around the edges if needed, then flip them onto wire racks to cool completely before frosting.
Frosting Directions
In a medium mixing bowl, I cream together the butter and powdered sugar.
I add 2 tablespoons of milk and vanilla, then beat until smooth. If the frosting feels too thick, I add a little more milk. If it feels too thin, I mix in a bit more powdered sugar until the consistency is just right.
Assembly Directions
I place the blue cake layer on my serving plate and spread a thin layer of frosting on top. Since I need frosting between all five layers, I use just enough to cover each one evenly.
I repeat the process with the green, yellow, orange, and red layers, stacking them carefully and spreading frosting between each layer.
Once assembled, I add sprinkles of my choice to the top for a finishing touch.
I sometimes change the color palette to match different themes or celebrations. I can use bold primary colors or soft pastel shades depending on the look I want.
For extra flavor, I occasionally add a hint of almond extract along with the vanilla. If I want a slightly richer frosting, I increase the butter slightly for a creamier texture.
I also enjoy decorating the top with themed sprinkles or even a light dusting of powdered sugar for a softer finish.
Storage/Reheating
I store leftover cake in an airtight container at room temperature for up to 2 days, or in the refrigerator for up to 5 days.
If refrigerated, I let slices sit at room temperature for about 20 to 30 minutes before serving so the frosting softens and the cake tastes its best.
I do not recommend microwaving, as it can alter the texture of the frosting.
FAQs
Can I use whole eggs instead of egg whites?
I prefer egg whites because they keep the cake light in color and texture, but I can use whole eggs if needed, knowing the color may change slightly.
How do I keep the colors vibrant?
I use gel food coloring for more concentrated color without thinning the batter.
Can I bake the layers in batches?
Yes, I can bake them in batches if I don’t have enough pans. I just make sure the batter rests briefly while waiting.
What makes this a “naked” cake?
I leave the sides unfrosted so the colorful layers are visible, creating a simple and rustic look.
Can I make this cake ahead of time?
I often bake the layers a day in advance and wrap them tightly once cooled. I frost and assemble the next day.
How do I prevent the cake from sticking to the pans?
I always coat the pans with cooking spray and flour to ensure easy removal.
Can I freeze the cake layers?
Yes, I wrap each cooled layer tightly in plastic wrap and freeze for up to 2 months.
How thick should the frosting layers be?
I spread just enough frosting to evenly cover each layer without making it too heavy.
Can I use a stand mixer?
I prefer using a hand mixer or stand mixer to achieve a smooth batter and fluffy frosting.
How do I get clean slices?
I use a sharp knife and wipe it clean between cuts to keep the layers neat and defined.
Conclusion
I enjoy how this Naked Pastel Rainbow Cake combines soft, colorful layers with just the right touch of frosting. It’s visually stunning, deliciously balanced, and always makes an impression when sliced. Whenever I want a dessert that’s both beautiful and satisfying, this cake is one I love to make and share.
