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Rainbow cake with white fondant and colorful layers
Stunning colorful rainbow cake for celebrations

Six-Layer Rainbow Cake with White Buttercream

Author: Flavelo
Recipes Cakes and Desserts
This Rainbow Cake is a celebration of patience and precision. A spectacular six-layer wonder where every layer is baked separately to preserve its vibrant color. The secret is a neutral white cake base that acts like a canvas, showing off the added colors perfectly. Hidden between thin layers of cream and a white fondant coating, the inside is a total surprise when sliced.
🕒 Prep Time 1 hr 30 mins
🍳 Cook Time 1 hr 30 mins
⌛ Total Time 3 hrs
🍽️ Servings 12 servings
🔥 Calories 430 kcal
🌍 Cuisine International

Ingredients

Equipment Needed

  • 6 cake pans of equal size (or bake in batches)
  • Digital scale
  • Gel food coloring kit
  • Turntable

Allergen Information

⚠️ Wheat
⚠️ Egg
⚠️ Milk

Instructions

1 ✓

Prepare the batter: Cream the butter and sugar, add eggs, then alternate adding the dry ingredients (flour, baking powder, salt) and milk.

Tip: It's important for the batter to be stable and smooth to hold the dye well.
2 ✓

Weigh the finished batter and divide into 6 exactly equal parts. Color each one individually.

Tip: Use a toothpick to add gel color. The color will deepen slightly during baking.
3 ✓

Bake the layers at 350°F (180°C) for about 12-15 minutes. Watch carefully so they don't brown! Let cool completely.

Tip: Thin layers bake and dry out quickly. Cover them with a kitchen towel while cooling.
4 ✓

Whip the heavy cream with the confectioners' sugar until very stiff peaks form.

Tip: The cream must be ice cold. You can use a cream stabilizer if needed.
5 ✓

Stack the layers in rainbow order (purple on bottom, red on top) with thin layers of cream in between. Crumb coat the outside.

Tip: This 'crumb coat' traps colorful crumbs so they don't show through the white fondant.
6 ✓

Cover with white fondant and decorate.

Tip: Whipped cream can sometimes melt fondant. It's safer to use a buttercream for the outer seal or serve immediately.

Recipe FAQ

Why did the edges turn brown?
Too high heat. Colorful cakes need lower baking temperatures so the sugar doesn't caramelize (brown), keeping the colors bright.

Ingredients

  • 2 3/4 cups All-Purpose Flour
  • 1 1/2 cups Granulated Sugar
  • 1 cup Unsalted Butter (room temperature)
  • 5 large Eggs
  • 3/4 cup Whole Milk
  • 2 1/2 tsp Baking Powder
  • 1 tsp Vanilla Extract
  • 1 3/4 cups Confectioners' Sugar
  • 2 cups Heavy Cream
  • 1 set Gel Food Coloring (Rainbow Colors)
  • 10 oz White Fondant
  • 1 pinch Salt