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Perfect Graduation Cookie Cake Recipe with Easy Buttercream Cap Decoration Tutorial

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A chewy, festive cookie cake decorated with a simple buttercream graduation cap, perfect for celebrating milestones with minimal fuss.

Ingredients

Scale
  • 1 cup (227g) unsalted butter, softened
  • 1 cup (200g) packed light brown sugar
  • 1/2 cup (100g) granulated sugar
  • 2 large eggs, room temperature
  • 2 teaspoons pure vanilla extract
  • 3 cups (375g) all-purpose flour
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1 1/2 cups (270g) semi-sweet chocolate chips
  • 1 cup (227g) unsalted butter, softened (for buttercream)
  • 3–4 cups (360-480g) powdered sugar, sifted
  • 2–3 tablespoons whole milk or heavy cream
  • 1 teaspoon pure vanilla extract (for buttercream)
  • Black gel food coloring or cocoa powder
  • Yellow or gold gel food coloring for tassel

Instructions

  1. Preheat the oven to 350°F (175°C). Grease a 9-inch round cake pan or line it with parchment paper.
  2. In a large bowl, cream together 1 cup softened unsalted butter, 1 cup light brown sugar, and 1/2 cup granulated sugar using an electric mixer on medium speed until light and fluffy (3-4 minutes).
  3. Beat in 2 large eggs one at a time, then stir in 2 teaspoons vanilla extract.
  4. In a separate bowl, whisk together 3 cups all-purpose flour, 1 teaspoon baking soda, and 1/2 teaspoon salt. Slowly add to wet ingredients, mixing on low speed until just combined.
  5. Gently fold in 1 1/2 cups semi-sweet chocolate chips.
  6. Spread the dough evenly into the prepared pan, about 1 inch thick.
  7. Bake for 20-25 minutes until edges are golden and center is set but slightly soft. A toothpick should come out with a few moist crumbs.
  8. Cool the cookie cake completely in the pan on a wire rack (about 1 hour).
  9. For the buttercream, beat 1 cup softened butter until creamy (about 2 minutes). Gradually add 3-4 cups powdered sugar alternating with 2-3 tablespoons milk, beating on low until combined.
  10. Add 1 teaspoon vanilla extract and beat on high for 3-4 minutes until fluffy.
  11. Divide frosting; tint most black (or with cocoa powder) and a small portion yellow or gold for the tassel.
  12. Spread black buttercream evenly over cooled cookie cake using an offset spatula to represent the cap.
  13. Pipe a square outline to mimic mortarboard edges and pipe a tassel line with yellow buttercream from center to edge with short strokes at the end.
  14. If buttercream is too soft to pipe, chill for 10-15 minutes before decorating.

Notes

Use softened butter, not melted, for ideal dough texture. Do not overbake to keep cookie chewy. Let cookie cool completely before frosting. Practice piping tassel beforehand. Buttercream can be made ahead and refrigerated. For gluten-free, substitute flour with almond or gluten-free blend. For vegan, use plant-based margarine and flax eggs.

Nutrition

Keywords: cookie cake, graduation cake, buttercream decoration, easy dessert, chocolate chip cookie, celebration dessert, party cake

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