Description
I wanted something unique and fun for my grandson’s birthday. I initially thought about doing a rainbow layer cake, but thought I might be able to achieve an actual rainbow arc if I used a fluted tube pan (such as Bundt®). I was thrilled when we sliced this and I saw how vibrant and arc-shaped the rainbow turned out. And my little guy was delighted with it … he thought I was magic!
Ingredients
- 2 tablespoons all-purpose flour, or as needed
- 1 package white cake mix
- 1 (1 ounce) package instant vanilla pudding mix
- 4 eggs, lightly beaten
- 1 cup sour cream
- ½ cup butter, melted
- ½ cup water
- 1 teaspoon white sugar
- 1 drop red paste food coloring, or as needed
- 1 drop purple gel food coloring, or as needed
- 1 drop blue paste food coloring, or as needed
- 1 drop green paste food coloring, or as needed
- 1 drop yellow paste food coloring, or as needed
- 1 drop orange paste food coloring, or as needed
- 1 (16 ounce) package prepared chocolate frosting
- ¼ cup rainbow sprinkles, or as needed
Instructions
- Preheat the oven to 350 degrees F (175 degrees C). Grease and flour a 10-cup fluted tube pan.
- Combine cake mix
- pudding mix
- eggs
- sour cream
- butter
- water
- and sugar in a mixing bowl. Beat on low speed until ingredients are moistened
- then beat on medium-high speed for 1 minute. Batter will be thick. Divide batter evenly into 6 bowls. Tint each batch a different color
- using enough food coloring paste to reach desired tone; colors will deepen and brighten when baked.
- Spoon red batter into the bottom of the prepared pan and smooth using an offset spatula to evenly distribute. Carefully spoon purple batter on top and spread with spatula
- pressing batter thinner near the inner edge and thicker at the outer edge of pan to create an arc effect. Repeat with blue
- green
- yellow
- and orange batters. Gently tap pan on the counter 3 times to allow batter to settle.
- Bake on the middle rack of the preheated oven until a toothpick inserted in the center comes out clean and top is just starting to brown
- 35 to 45 minutes. Be careful not to overbake.
- Cool cake in the pan for 10 minutes. Turn cake out onto a plate and allow to cool completely before frosting
- about 1 hour.
- Drizzle or spread frosting over cake and decorate with rainbow sprinkles.
Prep Time: 30 mins
Cook Time: 35 mins
Total Time: 2 hrs 15 mins
Servings: 12