This vibrant Rainbow Swirl Cake is a fun and festive dessert that’s sure to brighten up any celebration! Featuring a moist vanilla cake with swirls of rainbow-colored batter, this cake is visually stunning and tastes as good as it looks. It’s layered with a creamy, smooth cream cheese frosting, and topped with colorful piping for an eye-catching finish. Perfect for birthdays, parties, or any occasion that calls for a burst of color and flavor!
Ingredients (Serves 10-12)
Vanilla Cake
- 3 ½ cups All-purpose flour
- 2 tsp Baking powder
- ¾ tsp Baking soda
- 1 tsp Salt
- ¾ cup Unsalted butter (room temperature)
- ¼ cup Canola or vegetable oil
- 1 ½ cups White granulated sugar
- ¼ cup Sour cream (room temperature)
- 1 Tbsp Clear imitation vanilla (or pure vanilla extract)
- 4 large eggs (room temperature)
- 1 cup Buttermilk (room temperature)
- Food dye coloring (red, orange, yellow, green, blue)
Cream Cheese Frosting
- 2 cups Unsalted butter (slightly cold)
- 10 oz Cream cheese (room temperature)
- 8 ½ cups Powdered sugar (sifted)
- ½ tsp Salt
- 1 tsp Pure vanilla extract
- ⅓ cup Heavy cream
- Food dye coloring (for rainbow frosting)
Instructions
Vanilla Cake
- Prepare Cake Pans: Preheat the oven to 350°F. Grease three 8-inch cake pans with baking spray. Line the bottoms with parchment paper circles and spray again.
- Sift Dry Ingredients: In a medium bowl, sift together 3 ½ cups flour, 2 tsp baking powder, ¾ tsp baking soda, and 1 tsp salt. Set aside.
- Cream Butter, Oil, and Sugar: Using a mixer, beat ¾ cup butter, ¼ cup oil, and 1 ½ cups sugar on high speed for 3 minutes until light and fluffy. Scrape down the sides of the bowl as needed. Add ¼ cup sour cream and 1 Tbsp vanilla extract, and mix on medium until combined.
- Add Eggs: Add the eggs one at a time, beating on high speed for 2 minutes after each addition. Scrape the bowl to ensure everything is evenly incorporated.
- Incorporate Dry Ingredients and Buttermilk: Add ⅓ of the dry ingredients to the butter mixture, followed by half of the 1 cup buttermilk, and mix on low speed. Add another ⅓ of the dry ingredients and the remaining buttermilk. Finish with the last ⅓ of the dry ingredients, mixing until just combined.
- Add Food Coloring: Divide the batter evenly into the three prepared cake pans. Add 2 drops of each food color (red, orange, yellow, green, and blue) to the batter in each pan. Use a butter knife to gently swirl the colors together, creating a rainbow effect.
- Bake: Bake the cakes for 18-23 minutes or until a toothpick inserted into the center comes out clean. Allow the cakes to cool in the pans for 10 minutes before transferring them to a wire rack to cool completely.
Cream Cheese Frosting
- Beat Butter and Cream Cheese: Let the butter sit out for 30 minutes to soften slightly. Using a mixer, beat 2 cups butter and 10 oz cream cheese on high speed for 2 minutes until smooth.
- Add Powdered Sugar: Gradually add the sifted 8 ½ cups powdered sugar on low speed. Once combined, scrape down the bowl, then beat the mixture on high speed for 1-2 minutes until light and fluffy.
- Add Vanilla, Salt, and Cream: Add 1 tsp vanilla extract, ½ tsp salt, and ⅓ cup heavy cream. Beat on low until combined, then switch to high speed for an additional 1-2 minutes to achieve a smooth, fluffy frosting.
- Color the Frosting: Separate 1 ½ cups of the frosting into 4-5 bowls and color each one with a different food dye to create a rainbow. Spread each color onto a sheet of plastic wrap in vertical lines. Roll up the plastic wrap and cut off one end to prepare for piping.
Assembling the Cake
- Level the Cakes: Use a serrated knife to trim the tops of the cakes to ensure they are level.
- Layer the Cake: Place a small amount of frosting on the cake board to anchor the first layer. Place the first cake layer down and spread 1 cup of frosting evenly over the top. Repeat with the second and third layers.
- Crumb Coat: Frost the cake with a thin layer of frosting (crumb coat) to seal in the crumbs. Place the cake in the freezer for 15 minutes to set.
- Final Frosting: After the cake has chilled, apply a thicker layer of frosting. Use a piping bag fitted with a Wilton 1M tip to pipe rainbow swirls or a decorative border on top of the cake using the prepared rainbow frosting.
Description and Tips
This Rainbow Swirl Cake is a delightful way to add some color to your dessert table! With a buttery vanilla cake base, the colorful swirls inside create a surprise in every slice. The cake is covered in a rich and creamy cream cheese frosting, offering a nice balance to the sweetness of the cake.
Tips:
- Swirling the Colors: When swirling the food dye into the cake batter, be careful not to overmix. You want distinct swirls of color rather than blending them into a single shade.
- Room Temperature Ingredients: Ensure all your ingredients (butter, eggs, sour cream, buttermilk) are at room temperature for the best texture.
- Freezing the Crumb Coat: This quick freeze helps the final layer of frosting to go on smoothly without mixing in crumbs, resulting in a polished look.
- Creative Piping: The rainbow frosting adds a stunning finishing touch. You can pipe swirls, rosettes, or a simple border—get creative with your decoration!
This fun and colorful cake will be the star of any gathering!
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