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Rainbow Surprise Inside Cake

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Betty Crocker Kitchens
Updated Apr 17, 2026
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We've got a show-stopping dessert for you: it's a fun cake filled with a colorful, sweet surprise that tumbles out when you cut into it! This Rainbow Surprise Inside Cake will be a hit at birthday parties, holiday gatherings and other celebrations. You can even play with the colors of the candy filling to customize it for the occasion.

Rainbow Surprise Inside Cake

  • Prep Time 30 min
  • Total 3 hr 25 min
  • Servings 16
  • Ingredients 6
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Ingredients

  • 2 boxes Betty Crocker™ Delights Super Moist™ Party Rainbow Chip Cake Mix
  • Water, vegetable oil, and eggs called for on cake mix boxes
  • 2 tubs (12 oz) Betty Crocker™ Whipped Vanilla Frosting
  • 2 cups M&M's® candy-coated milk chocolate candies
  • 1 cup M&M's® minis candy-coated milk chocolate candies
  • 3/4 cup from 1 container Betty Crocker™ Parlor Perfect Ice Cream Topping Confetti Sprinkles

Instructions

  • Step 
    1

    Heat oven to 350°F (325°F for dark or nonstick pans). Spray the bottom and sides of 2 (8-inch) round cake pans; line with cooking parchment paper.

  • Step 
    2

    In a large bowl, beat 1 box of cake mix and the ingredients called for on the box with an electric mixer on medium speed for 2 minutes, scraping the bowl occasionally. Divide batter between pans. Bake as directed on the box for 8-inch round cake pans. Cool 10 minutes. Remove from the pans to a cooling rack; remove parchment paper. Cool completely, about 1 hour. Meanwhile, repeat mixing and baking with the second box of cake mix to make 2 more layers.

  • Step 
    3

    Level the cake layers by trimming off the rounded tops. In 2 of the layers, cut a circle out of the center, using a 4-inch round cutter.

  • Step 
    4

    Place 1 uncut cake layer on a cake stand or serving platter; spread 1/3 cup frosting on top. Top with 1 layer of cake with center removed; spread 1/3 cup frosting on top. Top with the second layer with the center removed; spread 1/3 cup frosting on top.

  • Step 
    5

    In a small bowl, mix chocolate candies and sprinkles. 

  • Step 
    6

    Fill the cake with candies and candy sprinkles. Gently press candies to level. 

  • Step 
    7

    Top with the final uncut cake layer. Frost the side and top of cake with remaining frosting. Store loosely covered at room temperature.

Nutrition

630 Calories
32g Total Fat
5g Protein
80g Total Carbohydrate
63g Sugars

Nutrition Facts

Serving Size: 1 Serving
Calories
630
Calories from Fat
290
Total Fat
32g
50%
Saturated Fat
14g
72%
Trans Fat
0g
Cholesterol
75mg
25%
Sodium
280mg
12%
Potassium
125mg
4%
Total Carbohydrate
80g
27%
Dietary Fiber
1g
4%
Sugars
63g
Protein
5g
% Daily Value*:
Vitamin A
4%
4%
Vitamin C
0%
0%
Calcium
10%
10%
Iron
6%
6%
Exchanges:
1 Starch; 0 Fruit; 4 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; 6 1/2 Fat;
Carbohydrate Choice
5
*Percent Daily Values are based on a 2,000 calorie diet.

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