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Perfect Pisces Birthday Cake Recipe Easy Ocean Swirl Mermaid Tail Top

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A whimsical ocean swirl birthday cake with a mermaid tail topper, combining light, fluffy texture and subtle layered flavors perfect for ocean-themed celebrations.

Ingredients

Scale
  • 2 ½ cups (310g) all-purpose flour
  • 2 ½ tsp baking powder
  • ½ tsp salt
  • 1 cup (226g) unsalted butter, softened
  • 1 ¾ cups (350g) granulated sugar
  • 4 large eggs, room temperature
  • 1 tbsp pure vanilla extract
  • 1 cup (240ml) whole milk, room temperature (can swap for almond milk for dairy-free)
  • 1 ½ cups (340g) unsalted butter, softened (for buttercream)
  • 5 cups (600g) powdered sugar, sifted
  • 2 tsp pure vanilla extract (for buttercream)
  • 2–3 tbsp heavy cream or milk (for desired consistency)
  • Blue, teal, and white gel food coloring
  • Pinch of sea salt
  • Fondant or modeling chocolate (white or pre-colored teal/blue) for mermaid tail
  • Edible shimmer dust or pearl dust (optional)

Instructions

  1. Preheat oven to 350°F (175°C). Grease two 8-inch cake pans and line with parchment paper.
  2. Sift together flour, baking powder, and salt in a medium bowl; set aside.
  3. Beat softened butter and granulated sugar on medium-high speed until pale and fluffy, about 4-5 minutes.
  4. Add eggs one at a time, beating well after each addition, then stir in vanilla extract.
  5. Reduce mixer speed to low; add dry ingredients in three additions alternating with milk, starting and ending with flour mixture. Beat just until combined.
  6. Divide batter evenly into prepared pans and smooth tops. Bake 30-35 minutes or until toothpick inserted comes out clean.
  7. Cool cakes in pans 10 minutes, then transfer to wire racks to cool completely.
  8. For buttercream, beat softened butter until creamy. Gradually add powdered sugar on low speed. Add vanilla, heavy cream or milk, and sea salt. Beat on high until light and fluffy.
  9. Divide buttercream into three bowls; tint one blue, one teal, and leave one white.
  10. Place one cake layer on serving plate; spread thin layer of white buttercream. Add second layer and crumb coat entire cake with white frosting. Chill 20 minutes.
  11. Dollop blue, teal, and white frosting randomly on cake sides and top. Use offset spatula or bench scraper to gently smooth and blend colors to mimic ocean waves.
  12. Roll out fondant or modeling chocolate to ¼-inch thickness. Cut mermaid tail shape, add texture, dust with shimmer if desired, let dry slightly, and place on cake before serving.

Notes

Do not overblend frosting colors to keep distinct swirls. Chill cake after crumb coat to prevent crumbs mixing into frosting. Use gel food coloring for vibrant hues without thinning buttercream. Make mermaid tail topper a day ahead to dry and harden. Buttercream consistency can be adjusted with milk or chilling. Practice swirling on parchment paper before frosting cake.

Nutrition

Keywords: birthday cake, ocean swirl, mermaid tail, Pisces cake, easy cake recipe, ocean themed cake, buttercream frosting, whimsical cake

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