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Ombre Buttercream Cake

A moist vanilla layer cake frosted with silky Swiss meringue buttercream in a gradient of three colors. Perfect for celebrations with a stunning visual effect.
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Prep Time 1 hour
Cook Time 30 minutes
Total Time 1 hour 30 minutes
Servings: 12
Course: Dessert
Cuisine: American
Calories: 480
Ingredients Equipment Method Notes

Ingredients
  

  • 2 1/2 cups all-purpose flour
  • 2 1/2 teaspoons baking powder
  • 1/2 teaspoon salt
  • 1 cup unsalted butter room temperature
  • 1 3/4 cups granulated sugar
  • 4 large eggs room temperature
  • 1 tablespoon vanilla extract
  • 1 cup whole milk room temperature
  • For Swiss Meringue Buttercream:
  • 6 large egg whites
  • 1 1/2 cups granulated sugar
  • 2 cups unsalted butter room temperature, cut into cubes
  • 1 teaspoon vanilla extract
  • 1/4 teaspoon salt
  • Gel food coloring pink, purple, or blue in three shades

Equipment

  • stand mixer with whisk attachment
  • three 8-inch round cake pans
  • offset spatula
  • piping bag with large round tip
  • turntable (optional)
  • cake scraper
  • food coloring (gel-based)

Method
 

  1. Preheat oven to 350°F (175°C). Grease three 8-inch round cake pans and line bottoms with parchment paper.
  2. Whisk flour, baking powder, and salt together in a medium bowl. Set aside.
  3. In a stand mixer with paddle attachment, cream butter and sugar on medium speed until light and fluffy, about 4 minutes. Scrape bowl.
  4. Add eggs one at a time, beating well after each. Mix in vanilla.
  5. Reduce speed to low. Add flour mixture in three additions, alternating with milk in two additions, starting and ending with flour. Mix just until combined — do not overmix.
  6. Divide batter evenly among pans (about 1 1/2 cups each). Smooth tops.
  7. Bake 22-26 minutes, until a toothpick inserted in center comes out clean or with a few moist crumbs. Let cool in pans 10 minutes, then turn out onto wire racks to cool completely.
  8. For buttercream: In a clean heatproof bowl, whisk egg whites and sugar together. Place over a pot of simmering water (not touching water), whisking constantly until sugar dissolves and mixture reaches 160°F (71°C) on a thermometer. This takes 5-7 minutes.
  9. Transfer mixture to stand mixer bowl with whisk attachment. Whip on medium-high until stiff peaks form and bowl feels cool to the touch, about 8-10 minutes.
  10. Switch to paddle attachment. With mixer on medium-low, add butter cubes one at a time, waiting until each is incorporated. Mixture may look curdled — keep beating. It will come together. Add vanilla and salt, then beat on medium for 2 minutes until silky and smooth.
  11. Divide buttercream into three bowls. Tint each with gel food coloring: lightest shade for bottom layer, medium for middle, darkest for top. Use a toothpick to add color gradually — less is more.
  12. Level cooled cake layers with a serrated knife if domed. Place first layer on a cake board or turntable. Spread a thin layer of lightest buttercream on top. Repeat with medium layer, then darkest. Apply a thin crumb coat over entire cake. Refrigerate 20 minutes.
  13. For final coat, fill a piping bag with remaining buttercream (keep colors separate or pipe together for a striped effect). Pipe frosting onto cake sides and top, then smooth with a cake scraper while spinning turntable. For a gradient look, scrape from bottom to top in one motion. Refrigerate 30 minutes before serving.

Notes

Store cake in an airtight container in the refrigerator for up to 5 days. Bring to room temperature 20 minutes before serving for best texture. For a dairy-free version, use plant-based butter and milk — but note the buttercream may be less stable. Always use gel food coloring; liquid drops will thin the frosting. If buttercream seems too soft, chill it for 15 minutes and rewhip. Common allergens: eggs, dairy, gluten. For dietary concerns, consult a qualified professional.