Making Every Celebration Sweeter, with Treatwell’s Special Rainbow Cake…

Let’s make every celebration sweeter with the special Rainbow cake from Treatwell. This is a cake about happiness, peace, and equality. There is nothing sad about rainbows and all those beautiful colours in harmony together.

Follow the steps accurately for best results…



  • 2 3/4 cups all-purpose flour
  • 1 1/2 teaspoons baking powder
  • 1/4 teaspoon salt
  • 1 1/2 cups granulated sugar
  • 1 cup Butter, softened
  • 4 large Eggs
  • 1 tablespoon vanilla extract
  • 1 cup milk
  • Red, orange, yellow, green, blue and purple gel food color
  • 2 cups Butter, softened
  • 6 1/2 cups powdered sugar
  • 1/4 teaspoon salt
  • 1/3 cup Heavy Whipping Cream
  • 1 tablespoon vanilla extract
  • Red, orange, yellow, green, blue and purple gel food colour


  • Heat oven to 350°F. Grease and flour 2 (8-inch) round cake pans or spray with baking spray, then set aside.
  • Combine flour, baking powder and 1/4 teaspoon salt in bowl  and set aside.
  • Beat granulated sugar and 1 cup butter in another bowl at medium speed, scraping bowl occasionally, until creamy. Add eggs, 1 at a time, beating well after each addition. Add 1 tablespoon vanilla and mix well. Add flour mixture alternatively with milk, beating at low speed after each addition, just until mixed.
  • Divide batter evenly among 6 bowls with about 3/4 cup each. Tint cake batters red, orange, yellow, green, blue and purple. Spread red and orange batter into prepared pans. Bake 8-10 minutes or until toothpick inserted into centre comes out clean. Cool 3 minutes after-that  remove from pans to cooling rack. Cool completely. Meanwhile, wash pans; grease and flour pans. Repeat with remaining colours until all cake layers are baked.
  • Beat 2 cups butter in medium bowl at medium speed until creamy. Gradually add powdered sugar and 1/4 teaspoon salt alternatively with whipping cream and 1 tablespoon vanilla, beating at low speed until well incorporated. Beat at medium speed until smooth and creamy. Remove 2 cups frosting; set aside. Divide remaining frosting evenly among 6 bowls with about 1/3 cup each. Tint frostings red, orange, yellow, green, blue and purple. Set aside.
  • Place purple cake layer onto serving plate, bottom-side up. Frost top with 1/4 cup white frosting. Place blue cake layer over frosting; frost with 1/4 cup white frosting. Continuing adding green, yellow, orange and red layers in that order, frosting with 1/4 cup white frosting between each layer. Frost outside of cake with remaining white frosting. This layer of frosting will be thin and cake will be visible through frosting. Once frosted, refrigerate cake 30 minutes.
  • Place each tinted frosting into individual resealable plastic food bag; push frosting to one corner. Cut off 1/2 inch from tip of corner. Place 18-inch-long piece of plastic food wrap onto counter surface. Pipe each colour onto plastic wrap to form wide 12-inch horizontal lines (using all of frosting) that are touching.
  • Finally, gently roll frosting lines into one large log using plastic wrap. Snip tip off one end of plastic wrap. Place cut-side down into piping bag fitted with size 1M open-star tip. Pipe rainbow rosettes onto cake beginning with middle of top of cake and working out and down sides so the most vibrant colours are on top of cake.
And Here is the Unforgettable Sweetness You’ll Keep Craving For. 
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