Simple Graduation Sheet Cake (Printable)

Moist vanilla sheet cake with creamy buttercream and colorful Class of 2026 piping for festive occasions.

# 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

→ Decoration

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

# How to Make It:

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 until evenly distributed.
03 - In a large bowl, beat softened butter and granulated sugar together for about 3 minutes until light and fluffy.
04 - Add eggs one at a time to the butter mixture, beating well after each addition. Mix in vanilla extract until fully combined.
05 - Gradually add flour mixture in three portions, alternating with milk, beginning and ending with flour. Mix until just combined, avoiding overmixing.
06 - Pour batter into prepared sheet pan and smooth the top surface evenly.
07 - Bake for 30 to 35 minutes until a toothpick inserted into the center comes out clean. Cool completely in the pan on a wire rack.
08 - Beat softened butter until creamy. Gradually add sifted powdered sugar, milk, vanilla extract, and salt. Beat for 3 to 5 minutes until fluffy and light. Tint portions with food coloring as desired.
09 - Spread an even layer of buttercream frosting over the completely cooled cake using a spatula.
10 - Transfer colored buttercream to a piping bag fitted with a small round tip. Pipe Class of 2026 on the cake surface. Add sprinkles or additional edible decorations as desired.

# Expert Tips:

01 -
  • It bakes in under an hour and comes together faster than you'd think, leaving room for actual decorating fun instead of panic.
  • The buttercream is genuinely fluffy and forgiving, so piping looks impressive even if you've never done it before.
  • One pan means one cleanup, which matters more than any food blogger admits.
02 -
  • Room temperature ingredients are not a suggestion; they're the difference between a smooth batter and one that looks broken and refuses to cooperate.
  • The alternating method (flour-milk-flour) prevents overmixing better than any other approach—overmixed cake becomes tough and dense, and there's no fixing it after baking.
  • Piping on slightly tacky frosting (not fresh and soft) gives you more control and less frosting dragging everywhere.
03 -
  • If your butter is still slightly cool, beat it alone for a minute before adding sugar—this head start prevents a grainy, separated frosting later.
  • Coloring buttercream with gel food coloring instead of liquid prevents the frosting from becoming too thin, and the colors stay vibrant instead of muddying.
  • A bench scraper or offset spatula is worth its weight in gold for spreading frosting smoothly; if you don't have one, a butter knife works, but patience becomes your tool.
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