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Rainbow Petal Sheet Cake

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By Betty Crocker Kitchens
Updated Sep 20, 2016
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This intricate petal design looks difficult to master, but it's actually a breeze! Try your hand at this frosting technique and use it for years (and cakes!) to come.

Rainbow Petal Sheet Cake

  • Prep Time 1 hr 20 min
  • Total 3 hr 30 min
  • Servings 12
  • Ingredients 7
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Ingredients

Cake

  • 1 box yellow cake mix with pudding
  • Water, oil and eggs called for on cake mix box

Frosting

  • 1 1/2 cups butter, softened
  • 5 cups powdered sugar
  • 2 teaspoons vanilla
  • 2 to 4 tablespoons milk
  • Blue, purple, green and orange gel food color

Instructions

  • Step 
    1
    Heat oven to 350°F (325°F for dark or nonstick pans). Grease bottom only of 1 (13x9-inch) pan. Make cake mix as directed on box using water, oil and eggs.
  • Step 
    2
    Bake 28 to 32 minutes or until a toothpick inserted in center comes out clean. Cool 10 minutes in pan; remove from pan to cooling rack. Cook completely, about 1 hour.
  • Step 
    3
    Meanwhile, beat butter with an electric mixer on low speed until creamy. Beat in the powdered sugar, 1 cup at a time, until smooth. Add vanilla and milk, 2 tablespoons at a time until well combined. If frosting is too thick, beat in more milk.
  • Step 
    4
    Use 1/2 cup frosting to frost a thin layer over entire cake. Divide remaining frosting into four bowls (about 3/4 cup frosting in each bowl). Mix blue, purple, green and orange food color, one into each bowl, until desired hue is reached.
  • Step 
    5
    Place each color in individual resealable food-storage plastic bag. Cut 1/2 inch off one corner of each bag. Pipe a dot of blue frosting and use back of teaspoon to pull frosting slightly. Repeat with remaining colors, alternating colors as you cover cake, slightly overlapping dots of frosting.

Nutrition

650 Calories
35g Total Fat
2g Protein
80g Total Carbohydrate
65g Sugars

Nutrition Facts

Serving Size: 1 Serving
Calories
650
Calories from Fat
310
Total Fat
35g
53%
Saturated Fat
17g
86%
Trans Fat
1g
Cholesterol
110mg
36%
Sodium
480mg
20%
Potassium
45mg
1%
Total Carbohydrate
80g
27%
Dietary Fiber
0g
0%
Sugars
65g
Protein
2g
% Daily Value*:
Vitamin A
15%
15%
Vitamin C
0%
0%
Calcium
8%
8%
Iron
4%
4%
Exchanges:
1/2 Starch; 0 Fruit; 5 Other Carbohydrate; 0 Skim Milk; 0 Low-Fat Milk; 0 Milk; 0 Vegetable; 0 Very Lean Meat; 0 Lean Meat; 0 High-Fat Meat; 7 Fat;
Carbohydrate Choice
5
*Percent Daily Values are based on a 2,000 calorie diet.

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