High School Graduation Sheet Cake (Printer-friendly)

Vanilla sheet cake with buttercream and Class of 2026 piping—festive, moist, and perfect for graduation celebrations.

# What You'll Need:

→ Sheet Cake

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

→ Buttercream Frosting

09 - 1 1/2 cups unsalted butter, room temperature
10 - 6 cups powdered sugar, sifted
11 - 2 teaspoons vanilla extract
12 - 4 to 6 tablespoons milk or heavy cream
13 - Food coloring (school colors and black for piping, as desired)

→ Decoration

14 - Sprinkles, edible glitter, or colored sugar (optional)

# How To Make It:

01 - Preheat oven to 350°F. Grease and line a 13x18-inch sheet pan with parchment paper.
02 - In a medium bowl, whisk together all-purpose flour, baking powder, and salt.
03 - In a large bowl, beat the unsalted butter and granulated sugar until pale and fluffy, about 3 to 4 minutes with an electric mixer.
04 - Add eggs individually, mixing well after each addition. Blend in vanilla extract until smooth.
05 - Add the dry ingredients to the butter mixture in three portions, alternating with the milk and beginning and ending with dry ingredients. Mix on low speed just to combine; avoid overmixing.
06 - Pour the batter into the prepared pan and level the surface with an offset spatula.
07 - Bake for 30 to 35 minutes, or until a toothpick inserted in the center emerges clean.
08 - Let the cake cool completely in the pan placed on a wire rack.
09 - In a large bowl, beat the unsalted butter until creamy, about 2 minutes. Gradually incorporate powdered sugar, beating thoroughly after each addition. Add vanilla extract and enough milk or cream to achieve a spreadable consistency.
10 - Divide the buttercream as needed for base, decorative borders, and Class of 2026 piping. Tint portions with your chosen food coloring.
11 - Spread a smooth layer of frosting over the cooled cake. Using piping bags fitted with round and star tips, pipe decorative borders and the 'Class of 2026' inscription. Apply sprinkles, edible glitter, or colored sugar as desired.
12 - Refrigerate the decorated cake for 30 minutes prior to slicing to allow the frosting to set.

# Expert Advice:

01 -
  • If you want a cake that actually tastes as good as it looks, this one’s your best kept secret.
  • The easy sheet cake format keeps things stress-free and lets everyone sneak a corner slice without much effort.
02 -
  • The very first time, I forgot to let the cake cool fully before frosting and ended up with a buttercream landslide.
  • Tinting large batches of frosting is far easier than trying to match tiny portions later—trust me, just go for it.
03 -
  • Check the cake for doneness by pressing gently: if it springs back, it's ready for cooling.
  • Save time by making both cake and buttercream in advance, then assembling the day of the party for peak freshness.
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