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Rainbow Surprise Inside Cake

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  • Prep 30 min
  • Total 2 hr 45 min
  • Servings 18
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A fun cake filled with a colourful sweet surprise that tumbles out when you cut into it.
Created Aug 19, 2016
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  • 2 boxes Betty Crocker™ SuperMoist™ rainbow bit cake mix
  • Water, vegetable oil and eggs called for on cake mix boxes
  • 2 containers Betty Crocker™ Whipped vanilla frosting
  • 2 cups (500 mL) candy coated chocolate pieces
  • 1 cup (250 mL) candy coated mini chocolate pieces
  • 3/4 cup (175 mL) assorted candy sprinkles


  • 1
    Heat oven to 350°F (180°C). Grease or spray two 8-inch (20 cm) round cake pans; place 8-inch (20 cm) round piece of cooking parchment paper in bottom of each pan. Grease or spray parchment paper. In large bowl, beat 1 box cake mix and ingredients called for on box with electric mixer on low speed 30 seconds, then on high speed about 2 minutes or until smooth. Spread in pans. Bake as directed on box. Cool 10 minutes; run knife around sides of pans to loosen cakes. Gently remove from pans to cooling rack; remove parchment paper. Cool completely, about 30 minutes. Meanwhile, repeat to make 2 more layers.
  • 2
    Flatten cake layers by trimming off rounded tops. In 2 layers, cut small round out of centre, using 4-inch (10 cm) round cutter.
  • 3
    To assemble cake: Place 1 uncut cake layer on cake stand or serving platter; spread 1/3 cup (75 mL) frosting on top. Top with 1 layer with centre removed; spread 1/3 cup (75 mL) frosting on top. Top with second layer with centre removed; spread 1/3 cup (75 mL) frosting on top.
  • 4
    Fill cake with candies and candy sprinkles. Gently press candies to level; top with full cake layer. Frost side and top of cake with remaining frosting.

Expert Tips

  • Tip 1
    Don’t have a 4-inch (10 cm) round cutter? Cut out a 4-inch (10 cm) circle of cooking parchment paper, and use it as a pattern.

Nutrition Information

630 Calories, 27 Total Fat, 92 Total Carbs

Nutrition Facts

Serving Size: 18 servings
Total Fat
Total Carbs
% Daily Value*:
*Percent Daily Values are based on a 2,000 calorie diet.
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