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Rainbow Layer Cake

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By Angie McGowan
Updated Aug 1, 2023
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You’ll be proud to make and serve a cake that’s as much fun as this one. And you don't have to be a pastry chef to pull it off! Rainbow Layer Cake is surprisingly easy to create, thanks to a little help from Betty Crocker™ Super Moist™ Vanilla Cake Mix and Betty Crocker™ Classic Gel Food Colors.

More About This Recipe

  • As the classic children’s song says, “Red, Orange, Yellow, Green, Blue, Purple Make the Rainbow Bright.” All the colors of that fabulous rainbow come together in a super-celebratory rainbow layer cake that’s perfect for any occasion. If you’ve been wondering how to make a rainbow cake, Betty is ready to walk you through all the steps. Rely on Betty Crocker™ Super Moist™ Vanilla Cake Mix and Betty Crocker™ Classic Gel Food Colors to streamline the baking process. Get ready for some major “oohs” and “aahs” when you cut into this full-spectrum masterpiece. And now that you’ve got rainbow cake mix mastered, you can find traditional favorites, quick-and-easy shortcuts and fun new twists in Betty’s Best Layer Cakes recipe collection.

Rainbow Layer Cake

  • Prep Time 1 hr 5 min
  • Total 3 hr 5 min
  • Servings 12
  • Ingredients 8
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Ingredients

Cake

Buttercream Frosting

  • 1 cup shortening
  • 1 cup butter, softened
  • 1 bag (2 lb) powdered sugar
  • 2 teaspoons vanilla
  • 3 to 4 tablespoons milk

Instructions

  • Step 
    1
    Heat oven to 350°F (325°F for dark or nonstick pans). Spray bottoms and sides of 3 (8-inch) round cake pans with cooking spray.
  • Step 
    2
    In large bowl, beat 1 box cake mix, water, oil and eggs called for on box, with electric mixer on medium speed 2 minutes, scraping bowl occasionally. Divide batter evenly among 3 small bowls. Using food colors, tint batter in 1 bowl blue, 1 bowl red and 1 bowl green to desired shades.
  • Step 
    3
    Bake 17 to 20 minutes or until toothpick inserted in center comes out clean. Cool 10 minutes; remove from pans to cooling racks. Cool completely, about 30 minutes.
  • Step 
    4
    Meanwhile, repeat with second box of cake mix, water, oil and eggs to make 3 more layers. Divide batter evenly among 3 small bowls. Using food colors, tint batter in 1 bowl yellow, 1 bowl orange (using red and yellow) and 1 bowl purple (using blue and red). Repeat baking and cooling.
  • Step 
    5
    In large bowl, beat shortening and butter with electric mixer on medium speed until well blended. On low speed, gradually beat in powdered sugar. Beat in vanilla. Add milk, 1 tablespoon at a time, beating until frosting is smooth. Beat on high speed until light and fluffy.
  • Step 
    6
    Trim off rounded tops of cake layers to level, if necessary. On serving plate, place purple cake layer. Frost with 1/2 cup frosting. Repeat with blue, green, yellow, orange and red cake layers. Frost top and side of cake with thin layer of frosting to form a crumb coat. Refrigerate 30 minutes. Spread remaining frosting on top and side of cake. Store loosely covered at room temperature.

Nutrition

990 Calories
49g Total Fat
6g Protein
131g Total Carbohydrate
102g Sugars

Nutrition Facts

Serving Size: 1 Serving
Calories
990
Calories from Fat
440
Total Fat
49g
75%
Saturated Fat
17g
87%
Trans Fat
1g
Cholesterol
135mg
45%
Sodium
520mg
22%
Potassium
45mg
1%
Total Carbohydrate
131g
44%
Dietary Fiber
0g
0%
Sugars
102g
Protein
6g
% Daily Value*:
Vitamin A
10%
10%
Vitamin C
0%
0%
Calcium
15%
15%
Iron
10%
10%
Exchanges:
1 Starch; 0 Fruit; 7 1/2 Other Carbohydrate; 0 Skim Milk; 0 Low-Fat Milk; 0 Milk; 0 Vegetable; 0 Very Lean Meat; 0 Lean Meat; 0 High-Fat Meat; 9 Fat;
Carbohydrate Choice
9
*Percent Daily Values are based on a 2,000 calorie diet.

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