Vanilla Sheet Cake Buttercream (Printable)

Moist vanilla sheet cake with smooth buttercream and piped floral decorations, ideal for festive gatherings.

# Ingredient List:

→ For the Sheet Cake

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

→ For the Buttercream

09 - 1½ cups unsalted butter, softened
10 - 6 cups powdered sugar, sifted
11 - ¼ cup whole milk
12 - 2 teaspoons pure vanilla extract
13 - Food coloring in pink, yellow, green, or as desired

# How to Prepare:

01 - Preheat oven to 350°F. Grease a 9x13-inch baking pan and line with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, and salt. Set aside.
03 - In a large bowl, beat softened butter and granulated sugar with an electric mixer until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, mixing well after each addition. Stir in vanilla extract until fully combined.
05 - Add flour mixture in three parts, alternating with milk, beginning and ending with flour. Mix until just combined; avoid overmixing.
06 - Pour batter into prepared pan and smooth the top with a spatula for even baking.
07 - Bake for 28–32 minutes, or until a toothpick inserted in the center comes out clean.
08 - Allow cake to cool in pan for 10 minutes, then turn out onto a wire rack to cool completely.
09 - Beat softened butter until creamy. Gradually add sifted powdered sugar, alternating with milk, beating until smooth and fluffy. Mix in vanilla extract.
10 - Divide buttercream into separate bowls and tint portions with food coloring for flowers, leaves, and other decorative elements.
11 - Spread a generous layer of plain buttercream over the cooled cake to create an even base.
12 - Fill piping bags fitted with flower and leaf tips with colored buttercream. Pipe flowers and leaves decoratively across the cake, focusing on corners and edges for a classic presentation.
13 - Optionally pipe a cross or add First Communion text using a small round tip for personalization.

# Expert Suggestions:

01 -
  • The cake stays impossibly moist for days, so you can bake it ahead without stress.
  • Piping flowers is easier than it sounds and gives you that bakery-quality look that feels like you've accomplished something real.
  • Twenty servings means one cake feeds your whole celebration without needing multiples.
02 -
  • Room temperature ingredients really do make a difference—I learned this the hard way when cold eggs curdled my batter and left me with an uneven texture.
  • Don't overmix once the flour goes in; I once creamed the batter too long out of nervousness and ended up with a dense, tight crumb that felt more like pound cake.
  • Gel food coloring is your secret weapon because liquid coloring makes buttercream weep and look watery in the piped flowers.
03 -
  • Invest in gel food coloring because it gives you vibrant, true colors that liquid coloring can't match, and your decorations won't look pale and washed out.
  • If your buttercream splits or looks grainy while mixing, add a tablespoon of milk and let the mixer run for a minute, which brings it back together smoothly.
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