Pisces Cake Sheet Ocean Waves (Printable Format)

A moist vanilla sponge with blue ombré buttercream and ocean wave piping for a striking aquatic look.

# What's Needed:

→ Cake

01 - 2 ½ cups all-purpose flour
02 - 2 ½ teaspoons baking powder
03 - ½ teaspoon salt
04 - 1 cup unsalted butter, room temperature
05 - 1 ¾ 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 - 1 ½ 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

# How To Make It:

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. Set aside.
03 - In a large bowl, beat butter and sugar until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, mixing thoroughly after each addition. Beat in vanilla extract until fully combined.
05 - Alternately add flour mixture and milk to the butter mixture, beginning and ending with flour. Mix until just combined, being careful not to overmix.
06 - Pour batter into prepared pan and smooth the top. Bake for 28-32 minutes, or until a toothpick inserted in the center comes out clean.
07 - Cool cake in pan for 10 minutes, then transfer to a wire rack to cool completely.
08 - Beat butter on medium speed until creamy, approximately 2 minutes. Gradually add powdered sugar, mixing on low speed. Add vanilla and milk, then beat until fluffy and smooth.
09 - Divide buttercream into 3-4 bowls. Tint each with varying shades of blue, ranging from deep ocean blue to pale aqua. Leave one portion white.
10 - Once cake is completely cool, spread a thin layer of white buttercream over the entire cake as a crumb coat. Chill for 20 minutes.
11 - With an offset spatula, layer blue buttercreams in wave-like shapes across the cake, starting with the darkest shade at the base and working up to the 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 a Pisces symbol made from white chocolate or fondant.

# Expert Advice:

01 -
  • The vanilla sponge stays impossibly moist for days, which means you can bake it ahead without stress.
  • Blue ombré buttercream looks restaurant-quality but requires zero fancy skills, just patience and a steady hand.
  • It's a sheet cake, so no stacking or leveling required, making it genuinely doable for a medium-skill baker.
02 -
  • Room temperature ingredients are not a suggestion—they're the difference between a fluffy, tender cake and a dense, separated disaster that no amount of frosting can fix.
  • Gel food coloring is worth seeking out because liquid coloring will dilute your frosting's texture, forcing you to add more powdered sugar and changing the taste.
  • Chilling between decorating steps sounds fussy, but it genuinely makes the difference between waves that blur together and waves with crisp definition.
03 -
  • If your frosting breaks or looks greasy after adding powdered sugar, stop, set it aside for five minutes, and beat it again from cold—sometimes it just needs a moment to pull itself together.
  • Use a small offset spatula for detail work, and keep it dipped in hot water and wiped clean between strokes to prevent frosting buildup that disrupts your wave pattern.
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