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Rainbow Chip Birthday Cake

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Edited by Angela Ritchie
Updated Oct 6, 2025
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Every birthday deserves a cake that feels as joyful as the celebration itself, and nothing says party quite like a rainbow chip layer cake. Bursting with colorful candy chips baked right into the soft, fluffy layers, this cake brings instant fun to the dessert table. Starting with a box of rainbow chip cake mix, it’s easy to whip up a bakery-worthy treat at home. The tender cake pairs perfectly with a light and fluffy homemade frosting made from marshmallow creme and butter, or you can keep it classic with rainbow chip frosting straight from the tub. Finish with a generous shake of rainbow sprinkles, and you’ve got a centerpiece that’s as cheerful as it is delicious. Whether you’re celebrating a milestone or simply adding some color to an ordinary day, this cake guarantees smiles with every slice.

Recipe Ingredients

Just 10 simple ingredients are needed to make this impressive layer cake.

Rainbow Chip Cake Mix: Betty Crocker™ Delights Super Moist™ Party Rainbow Chip Cake Mix bakes up light, fluffy layers dotted with colorful candy bits that make every slice feel like a celebration.

Eggs, Oil, and Water: The simple ingredients called for on the box give the cake its tender crumb and rich flavor, making sure it stays moist from the first bite to the last.

Marshmallow Creme: This sweet and fluffy ingredient creates a light, cloud-like texture when whipped into homemade frosting, adding a fun twist to classic buttercream.

Powdered Sugar: Adds structure and fluff, creating frosting that’s smooth, stable, and easy to work with.

Butter: Softened butter adds richness and creaminess to the frosting, balancing out the sweetness of the marshmallow creme and sugar.

Vanilla: Just a touch enhances the frosting with warm, bakery-style flavor.

Milk: A splash of milk brings the frosting to the perfect spreadable consistency.

Rainbow Sprinkles: A fun, colorful, finishing touch—rainbow sprinkles add instant celebration to your cake.

How to Make Rainbow Chip Birthday Cake

How to Make Rainbow Chip Birthday Cake

Here’s a preview for how to make Rainbow Chip Birthday Cake but continue reading for the full recipe and ingredient list below.

1. Mix and Bake

Prepare Betty Crocker™ Delights Super Moist™ Party Rainbow Chip Cake Mix with water, oil, and eggs as directed on the box. Bake in two greased round cake pans until a toothpick inserted in the center comes out clean. Cool completely.

2. Make the Frosting

For homemade frosting, beat marshmallow creme, softened butter, vanilla, and powdered sugar until fluffy. Add milk gradually until smooth and spreadable. Or use 2 tubs Betty Crocker™ Original Rainbow Chip Frosting for a quick shortcut.

3. Assemble and Decorate

Place one cooled cake layer on a serving plate, frost the top, then add the second layer. Frost the side and top with remaining frosting. Finish with colorful Betty Crocker™ sprinkles for a festive birthday-ready cake.

How to Store Rainbow Chip Birthday Cake

Here are a few tips for storing leftover rainbow chip cake.

Refrigerator

Store your frosted cake in an airtight container in the refrigerarot for up to 5 days. If you have room, a cake dome works great for this. Be sure to let the cake sit out for about 30 minutes before serving so the cake returns to its soft, tender texture.

Freezer

Wrap leftover slices tightly in plastic wrap or foil and place in a resealable freezer bag. Freeze for up to 1 month. Thaw at room temperature for a couple of hours before serving.

Rainbow Chip Birthday Cake

  • Prep Time 30 min
  • Total 2 hr 0 min
  • Servings 12
  • Ingredients 8
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Ingredients

Cake

Frosting & Decoration

  • 1 jar (7 oz) marshmallow creme (1 1/2 cups)
  • 1 cup butter, softened
  • 1/2 teaspoon vanilla
  • 1 to 2 tablespoons milk
  • 2 1/4 cups powdered sugar
  • Assorted Betty Crocker™ sprinkles

Instructions

  • Step 
    1

    Heat oven to 350°F (325°F for dark or nonstick pans). Grease only the bottoms of 2 (8- or 9-inch) round cake pans with shortening or baking spray with flour.

  • Step 
    2

    Make, bake, and cool cake as directed on the cake mix box for 8- or 9-inch round cake pans. Cool completely, about 1 hour.

  • Step 
    3

    Meanwhile, in a large bowl, beat marshmallow creme, softened butter, vanilla, and 1 tablespoon milk with an electric mixer on medium speed until blended. Beat in powdered sugar until fluffy. If necessary, beat in more milk, a few drops at a time, until thin enough to spread.

  • Step 
    4

    Place 1 cake layer, top side down, on serving plate; spread with about 1 cup frosting. Top with second cake layer, top side up. Frost side and top of cake with remaining frosting. Decorate with your favorite rainbow sprinkles.

Nutrition

Nutrition Facts are not available for this recipe
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