Name: Rainbow Layer Cake
Prep time: 30 min
Cook time: 20 min
Total time: 2 h
Cuisine: American
Ingredients: 3 cups all-purpose flour; 1 tbsp baking powder; 1/2 tsp baking soda; 1/2 tsp salt; 1 cup unsalted butter, softened; 2 cups granulated sugar; 4 large eggs; 1 tbsp vanilla extract; 1 1/2 cups buttermilk; Gel food coloring (red, orange, yellow, green, blue, purple); 4 cups powdered sugar (for frosting); 1 cup unsalted butter, softened (for frosting); 2-3 tbsp heavy cream (for frosting); 1 tsp vanilla extract (for frosting)

Jump to Recipe

A rainbow layer cake is a stunning and vibrant dessert made of multiple colored sponge layers, stacked with creamy frosting in between. Its eye-catching appearance makes it perfect for birthdays, celebrations, or any event where a showstopping dessert is desired. Each slice reveals the full spectrum of colors, creating a delightful surprise with every cut.

Why You’ll Love This Recipe

This rainbow layer cake is not only visually impressive but also deliciously soft and moist. The cake layers are light, fluffy, and filled with a classic vanilla flavor that complements the rich, creamy frosting. The colors make it perfect for festive occasions, and despite its elaborate appearance, it is easy to customize and prepare with simple baking techniques. Whether you’re hosting a party or just want to impress your guests, this cake will not disappoint.

ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

All-purpose flour
Baking powder
Salt
Unsalted butter
Granulated sugar
Eggs
Pure vanilla extract
Whole milk
Gel food coloring (red, orange, yellow, green, blue, and purple)
Heavy cream or whipping cream
Powdered sugar (for frosting)
Cream cheese or butter (for frosting base)

directions

Preheat your oven to 350°F (175°C). Grease and line six 8-inch round cake pans or bake in batches if you have fewer pans.
In a medium bowl, whisk together flour, baking powder, and salt. Set aside.
In a large mixing bowl, cream the butter and sugar until light and fluffy. Add eggs one at a time, mixing well after each addition. Stir in vanilla extract.
Gradually add the dry ingredients to the wet mixture, alternating with milk. Begin and end with the dry ingredients. Mix until smooth.
Divide the batter evenly into six bowls. Tint each portion with a different gel food coloring to achieve vibrant hues.
Pour each colored batter into a prepared pan and bake for 15–20 minutes, or until a toothpick inserted into the center comes out clean.
Let cakes cool in pans for 10 minutes, then transfer to wire racks to cool completely.
For the frosting, beat cream cheese or butter with powdered sugar and a bit of cream until smooth and fluffy.
Once layers are fully cooled, level them with a knife if necessary.
Stack the layers in rainbow order (red on top or bottom, as desired), spreading a layer of frosting between each. Cover the entire cake with a final layer of frosting.
Chill slightly before serving for neater slices.

Servings and timing

This rainbow layer cake serves approximately 12 to 14 people. Preparation and baking time takes about 1 hour and 30 minutes, with additional cooling and assembly time bringing the total to around 2 hours and 30 minutes.

Variations

Use flavored extracts for each layer, such as lemon, almond, or strawberry, for a unique taste experience.
Substitute cream cheese frosting with Swiss meringue or whipped buttercream.
Create a marbled rainbow effect by swirling the batter in fewer pans instead of layering.
Make a vegan version using plant-based milk, egg substitutes, and dairy-free frosting ingredients.
For a gluten-free option, use a gluten-free flour blend designed for baking.

storage/reheating

Store the cake covered in the refrigerator for up to 5 days. Allow it to come to room temperature before serving. For longer storage, wrap individual slices in plastic wrap and freeze them for up to 2 months. Thaw slices overnight in the refrigerator and bring to room temperature before eating. Reheating is not necessary unless you prefer a slightly warm slice; if so, microwave for 10–15 seconds.

FAQs

What kind of food coloring works best for a rainbow cake?

Gel food coloring is recommended because it provides vibrant color without altering the consistency of the batter.

Can I use natural food coloring?

Yes, but natural dyes may produce less vibrant colors and may affect the flavor slightly.

How do I keep the layers from sticking to the pan?

Grease the pans thoroughly and line the bottoms with parchment paper to ensure easy release.

Do I need to level the cake layers?

Yes, leveling the layers helps create a stable and even cake stack, especially with multiple layers.

Can I make the cake layers in advance?

Yes, you can bake the layers a day ahead. Wrap them tightly in plastic wrap and store at room temperature or refrigerate.

What is the best way to frost the cake?

Use a crumb coat first—a thin layer of frosting—to trap crumbs, then chill and apply the final frosting layer for a clean finish.

Can I use boxed cake mix?

Yes, boxed vanilla cake mix can be used. Divide the batter and color each portion before baking.

How can I make the cake more moist?

Add a tablespoon of sour cream or yogurt to the batter for added moisture.

Is this cake suitable for children’s parties?

Absolutely. The colorful presentation is especially appealing to kids and makes for a fun and festive centerpiece.

Can I use different pan sizes?

You can use different pan sizes, but be sure to adjust the baking time accordingly and avoid overfilling.

Conclusion

The rainbow layer cake is a dazzling dessert that combines visual appeal with classic flavor. With its soft sponge layers, creamy frosting, and vibrant presentation, it’s an ideal choice for special occasions and celebrations. Easy to adapt and sure to impress, this cake is a delightful treat for bakers and guests alike