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Perfect Galaxy Swirl Leo Birthday Cake with Easy Gold Star Rosettes

galaxy swirl leo birthday cake - featured image
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A stunning galaxy swirl birthday cake with vibrant colors and shimmering gold star rosettes, perfect for celebrating a Leo’s fiery spirit or any special occasion.

Ingredients

Scale
  • 2 ½ cups (312 g) all-purpose flour
  • 2 ½ tsp baking powder
  • ½ tsp salt
  • 1 cup (227 g) unsalted butter, softened
  • 1 ¾ cups (350 g) granulated sugar
  • 4 large eggs, room temperature
  • 1 tbsp pure vanilla extract
  • 1 cup (240 ml) whole milk or buttermilk
  • Gel food coloring in purple, navy blue, and black
  • 1 cup (227 g) unsalted butter, softened (for frosting)
  • 4 cups (480 g) powdered sugar, sifted
  • 2 tsp pure vanilla extract (for frosting)
  • 3–4 tbsp heavy cream or milk (for frosting)
  • Edible gold dust or gold food paint

Instructions

  1. Preheat oven to 350°F (175°C). Grease two 8-inch round cake pans and line with parchment paper.
  2. In a medium bowl, sift together flour, baking powder, and salt. Set aside.
  3. Using a mixer, beat 1 cup softened butter with 1 ¾ cups sugar on medium speed until light and fluffy, about 3-4 minutes.
  4. Add eggs one at a time, mixing well after each addition. Stir in vanilla extract.
  5. Alternately add dry mixture and 1 cup milk (or buttermilk) in three parts, starting and ending with dry mix. Mix on low speed just until combined.
  6. Divide batter evenly into three bowls. Add gel food colors: one purple, one navy blue, and one black. Stir gently.
  7. In each prepared pan, drop spoonfuls of each colored batter randomly. Use a skewer or butter knife to swirl gently to create a galaxy effect.
  8. Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean. Rotate pans halfway through baking.
  9. Remove cakes from pans and transfer to cooling racks. Cool completely before frosting.
  10. Prepare frosting by beating 1 cup softened butter until creamy. Gradually add powdered sugar, vanilla, and 3-4 tbsp cream. Beat until fluffy, adjusting consistency as needed.
  11. Place one cake layer on serving plate. Spread a thin layer of frosting, then top with second layer. Cover entire cake with crumb coat and chill for 15 minutes.
  12. Apply final layer of frosting smoothly using an offset spatula.
  13. Pipe gold star rosettes around cake edge using a piping bag fitted with a star tip. Lightly brush each star with edible gold dust or paint for shimmer.

Notes

Use gel food coloring for vibrant colors; liquid colors will dull the swirl. Chill batter briefly if colors blend too much during swirling. Chill cake after crumb coat for easier frosting application. If frosting is too soft, refrigerate for 10-15 minutes before piping. Practice piping rosettes on parchment paper before decorating the cake.

Nutrition

Keywords: galaxy cake, birthday cake, Leo birthday cake, gold star rosettes, swirl cake, vanilla cake, cosmic cake, celebration cake

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