Pisces Sheet Cake Ocean Wave (Printable version)

Moist vanilla sponge paired with layered blue buttercream mimics ocean waves for a striking dessert presentation.

# What You'll Need:

→ Cake

01 - 2½ cups all-purpose flour
02 - 2½ teaspoons baking powder
03 - ½ teaspoon salt
04 - 1 cup unsalted butter, room temperature
05 - 1¾ cups granulated sugar
06 - 4 large eggs, room temperature
07 - 1 tablespoon pure vanilla extract
08 - 1 cup whole milk, room temperature

→ Buttercream Frosting

09 - 1½ cups unsalted butter, room temperature
10 - 5 cups powdered sugar, sifted
11 - 2 teaspoons pure vanilla extract
12 - ¼ cup whole milk, room temperature
13 - Blue gel food coloring in various shades
14 - White gel food coloring

→ Decoration

15 - Edible pearls or sugar pearls, optional
16 - White chocolate or fondant for Pisces symbol, optional

# Directions:

01 - Preheat oven to 350°F. Grease and line a 9x13-inch sheet cake pan with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, and salt until evenly distributed.
03 - In a large bowl, beat butter and sugar until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, mixing well after each addition. Beat in vanilla extract until fully combined.
05 - Alternately add flour mixture and milk to butter mixture, beginning and ending with flour. Mix until just combined without overworking.
06 - Pour batter into prepared pan and smooth top. Bake for 28-32 minutes, or until a toothpick inserted in center comes out clean.
07 - Cool cake in pan for 10 minutes, then transfer to wire rack and cool completely before frosting.
08 - Beat butter on medium speed until creamy, about 2 minutes. Gradually add powdered sugar on low speed. Add vanilla and milk; beat until fluffy and smooth.
09 - Divide buttercream into 3-4 bowls. Tint each with varying shades of blue from deep ocean to pale aqua. Leave one portion white.
10 - Once cake is completely cool, spread thin layer of white buttercream over entire cake as crumb coat. Chill for 20 minutes.
11 - Using offset spatula, layer blue buttercreams in wave-like shapes across cake. Start with darkest shade at base and work up to lightest. Use swooping motions to mimic ocean waves.
12 - Pipe or swirl white buttercream on top to create sea foam effect.
13 - Optionally decorate with edible pearls and add Pisces symbol made from white chocolate or fondant.

# Expert Advice:

01 -
  • The vanilla sponge stays impossibly moist for days, which means you can actually make this ahead without stress.
  • Blue ombré frosting is easier than it looks—the gradient happens naturally as you layer different shades without perfect precision.
  • It's a show-stopping dessert that tastes homemade and feels special, but doesn't require fancy equipment or professional decorating skills.
02 -
  • Room temperature ingredients are not a suggestion—they're essential for a cake that rises properly and tastes light instead of dense.
  • Gel food coloring is the secret weapon here; liquid coloring will thin your buttercream and ruin the texture you've worked to create.
  • Chill the cake between major decorating steps, even if it feels like you're slowing down, because cold frosting holds waves and shapes so much better than warm frosting.
03 -
  • If your buttercream looks grainy or broken after beating, it usually means the ingredients weren't quite at room temperature or you added food coloring too quickly—just keep beating and it will come back together.
  • Use a bench scraper or small knife to get crisp transitions between your ombré layers instead of blending them completely, which keeps the color distinction visible and striking.
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