Vanilla Sheet Cake Buttercream Flowers (Printer-Friendly)

Moist vanilla sheet cake with smooth buttercream and beautiful piped floral decorations.

# What You’ll Need:

→ Sheet Cake

01 - 2 ½ cups all-purpose flour
02 - 2 ½ 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

→ Buttercream

09 - 1 ½ cups unsalted butter, softened
10 - 6 cups powdered sugar, sifted
11 - ¼ cup whole milk
12 - 2 teaspoons pure vanilla extract
13 - Food coloring as desired

# How to Make It:

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.
03 - In a large bowl, beat butter and sugar with an electric mixer until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, mixing well after each addition. Mix in vanilla extract.
05 - Add flour mixture in three parts, alternating with milk, beginning and ending with flour. Mix until just combined without overmixing.
06 - Pour batter into prepared pan and smooth the top with a spatula.
07 - Bake for 28–32 minutes, or until a toothpick inserted in the center comes out clean.
08 - Let cake cool in pan for 10 minutes, then turn out onto a wire rack to cool completely.
09 - Beat butter until creamy. Gradually add powdered sugar, alternating with milk, beating until smooth and fluffy. Mix in vanilla extract.
10 - Divide buttercream into bowls and tint portions with food coloring for flowers and leaves.
11 - Spread a generous layer of plain buttercream over cooled cake as the base layer.
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.

# Expert Tips:

01 -
  • The cake stays impossibly moist for days, so you can actually bake it ahead without stress.
  • Piping flowers feels intimidating until you realize buttercream is forgiving and mistakes just look like rustic charm.
  • It feeds a crowd without requiring three bowls of batter or complicated techniques.
02 -
  • Room temperature ingredients are non-negotiable—cold butter and eggs won't incorporate properly, and you'll end up with a dense cake.
  • Don't overmix the batter after adding flour; a few lumps of flour are fine and will smooth out in the oven, but overmixing creates a tough, rubbery crumb.
  • Gel food coloring is your secret weapon for buttercream decoration because it won't thin out your frosting like liquid coloring does.
03 -
  • Sift your powdered sugar before mixing—this single step eliminates lumps that can ruin smooth buttercream.
  • If your buttercream is too soft to pipe, refrigerate it for 15 minutes; if it's too stiff, add milk one teaspoon at a time and beat it in.
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