Galaxy Graduation Cake Stars (Printable)

A celestial buttercream cake featuring shimmering edible stars and vibrant galaxy hues for special celebrations.

# Required Ingredients:

→ For the Cake

01 - 2½ cups all-purpose flour
02 - 2 cups granulated sugar
03 - 1 cup whole milk, room temperature
04 - 1 cup unsalted butter, softened
05 - 4 large eggs, room temperature
06 - 2½ teaspoons baking powder
07 - ½ teaspoon salt
08 - 1 tablespoon vanilla extract

→ For the Galaxy Buttercream

09 - 1½ cups unsalted butter, softened
10 - 5 cups powdered sugar, sifted
11 - ¼ cup whole milk
12 - 2 teaspoons vanilla extract
13 - Gel food coloring: black, navy blue, purple, pink, teal

→ For Decoration

14 - Edible gold and silver star sprinkles
15 - Edible glitter or luster dust
16 - White gel food coloring

# Preparation Steps:

01 - Preheat oven to 350°F. Grease and line three 8-inch round cake pans with parchment paper.
02 - In a large bowl, cream together butter and sugar until light and fluffy. Add eggs one at a time, beating well after each addition. Mix in vanilla extract.
03 - In a separate bowl, whisk together flour, baking powder, and salt.
04 - Add dry ingredients to wet mixture in three parts, alternating with milk, beginning and ending with flour. Mix until just combined.
05 - Divide batter evenly among prepared pans. Bake for 30 to 35 minutes or until a toothpick inserted in the center comes out clean.
06 - Cool cakes in pans for 10 minutes, then transfer to wire racks to cool completely.
07 - Beat butter until creamy. Gradually add powdered sugar, then milk and vanilla. Beat until fluffy.
08 - Divide buttercream into four or five bowls. Tint each with a different galaxy color using gel food coloring.
09 - Place random spoonfuls of each color onto plastic wrap. Roll up to form a log. Snip one end and transfer to a piping bag fitted with a large round tip.
10 - Place one cake layer on a serving plate. Spread a thin layer of galaxy buttercream. Repeat with remaining layers.
11 - Apply a generous crumb coat all over the cake. Chill for 20 minutes.
12 - Pipe and spread galaxy buttercream over the cake, swirling gently with an offset spatula to create a marbled galaxy effect.
13 - Use white gel food coloring and a food-safe paintbrush or splatter tool to flick on stars across the cake surface.
14 - Decorate with edible gold and silver star sprinkles and a sprinkle of edible glitter or luster dust. Optionally add a graduation cap cake topper.

# Expert Suggestions:

01 -
  • It looks like you spent hours perfecting an edible work of art, but the technique is forgiving enough that imperfections just add to the cosmic charm.
  • The buttercream is silky and holds its color beautifully, so your galaxy actually stays vibrant and gorgeous from morning celebrations through evening parties.
  • You get three cake layers instead of two, which means more of that tender crumb and more surface area for showing off your swirled masterpiece.
02 -
  • Room temperature ingredients are absolutely critical—I learned this the hard way when my first attempt ended up broken and separated because I grabbed cold eggs straight from the fridge.
  • Sifting the powdered sugar before adding it to the buttercream changes everything; unsifted sugar creates grittiness that no amount of beating fixes.
  • The galaxy buttercream log technique requires patience to roll gently; rush it and your colors blend into murky brown instead of staying distinct and beautiful.
03 -
  • Invest in an electric mixer if you don't have one—your arm will thank you and the buttercream turns out noticeably fluffier and more stable.
  • Keep the finished cake in a cool room rather than the fridge; cold buttercream loses some of its silky texture and the colors appear slightly muted.
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