Simple Graduation Sheet Cake (Printable Version)

A moist vanilla sheet with creamy buttercream and colorful Class of 2026 piping for celebration.

# 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, softened
05 - 1¾ 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 cup unsalted butter, softened
10 - 4 cups powdered sugar, sifted
11 - ¼ cup whole milk
12 - 2 teaspoons vanilla extract
13 - Pinch of salt
14 - Food coloring for school colors, optional

→ Decoration

15 - Food coloring for piping Class of 2026
16 - Sprinkles or edible decorations, optional

# Steps:

01 - Preheat oven to 350°F. Grease a 9x13-inch sheet pan and line with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, and salt.
03 - In a large bowl, beat butter and sugar together until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in vanilla extract until combined.
05 - Gradually add flour mixture in three parts, alternating with milk, beginning and ending with flour. Mix until just combined.
06 - Pour batter into prepared pan and smooth the top. Bake for 30 to 35 minutes, or until a toothpick inserted into the center comes out clean.
07 - Allow cake to cool completely in the pan on a wire rack before frosting.
08 - Beat softened butter until creamy. Gradually add powdered sugar, milk, vanilla, and salt. Beat for 3 to 5 minutes until fluffy. Tint portions with food coloring as desired.
09 - Spread an even layer of buttercream over the cooled cake.
10 - Use colored buttercream in a piping bag fitted with a small round tip to pipe Class of 2026 on top. Add sprinkles or other edible decorations as desired.

# Expert Insights:

01 -
  • It feeds a crowd without fussing—one sheet pan, one mixer, and you've got dessert for sixteen people.
  • The crumb stays moist and tender because the buttermilk-flour ratio is forgiving, which means even if you slightly overbeat it, you're still winning.
  • Personalization is built in—change the food coloring, switch the message on top, make it yours without any extra steps.
02 -
  • Room temperature ingredients are not a suggestion—cold eggs or butter will refuse to emulsify properly and you'll end up with a grainy, broken texture that no amount of beating can fix.
  • The alternating wet-and-dry method exists because adding all the flour at once to the creamed butter creates gluten development that makes the cake tough, so resist the urge to speed this step up.
  • Powdered sugar absolutely must be sifted or you will spend ten minutes fighting lumps in your frosting that ruin your piping work.
03 -
  • If you're nervous about piping, write out what you want to pipe on the frosting with a toothpick first—it acts like a pencil sketch that guides your piping bag hand.
  • Cold frosting pipes cleaner lines than room temperature frosting, so chill your piping bag for five minutes before you start if your kitchen is warm.
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