Rainbow Marble Cake Recipe - Colorful and Decadent Celebration Cake

Name: Rainbow Marble Cake Recipe - Colorful and Decadent Celebration Cake
Total time: 50 min
Ingredients: 3 cups all-purpose flour.; 3 cups granulated sugar.; 2 1/2 tsp baking powder.; 1 tsp salt.; 1 cup unsalted butter, room temperature (2 sticks).; 2 tsp vanilla extract.; 1 cup egg whites (about 7 egg whites).; 1 1/2 cups buttermilk, room temperature.; 1/8 cup vegetable oil.; Gel food coloring in purple, blue, green, yellow, orange, red.; 3 cups unsalted butter, room temperature (for frosting).; 11 cups powdered sugar (for frosting).; 1 tsp salt (for frosting).; 1/3 cup heavy cream (or whipping cream for frosting).; 1 1/2 Tbsp vanilla extract (for frosting).; Gel food coloring in purple, blue, green, yellow, orange, red (for frosting).

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This Rainbow Marble Cake features vibrant swirls of color and a decadent vanilla buttercream frosting. Perfect for birthdays, pride celebrations, or any festive event!

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