Perfect Chocolate Diploma Cookies with Elegant Royal Icing
These chocolate diploma-shaped cookies feature a rich, bittersweet chocolate base paired with smooth, glossy royal icing. Perfect for celebrations, they offer a crisp edge with a soft, chewy center and an elegant finish.
- Prep Time: 15 minutes
- Cook Time: 12 minutes
- Total Time: 2 hours 30 minutes
- Yield: 24 cookies 1x
- Category: Dessert
- Cuisine: American
Ingredients
Scale
- 2 ½ cups (312 g) all-purpose flour, sifted
- ¾ cup (75 g) unsweetened cocoa powder, preferably Dutch-processed
- 1 teaspoon baking powder
- ½ teaspoon salt
- 1 cup (227 g) unsalted butter, softened
- 1 cup (200 g) granulated sugar
- 1 large egg, room temperature
- 2 teaspoons pure vanilla extract
- 4 cups (480 g) powdered sugar, sifted
- 3 large egg whites or 6 tablespoons pasteurized egg whites
- 1 tablespoon fresh lemon juice
- 1 teaspoon vanilla extract
- Optional: gel food coloring (white or any color)
Instructions
- In a medium bowl, sift together flour, cocoa powder, baking powder, and salt. Set aside.
- In a mixing bowl, beat softened butter and granulated sugar until light and fluffy, about 3-4 minutes.
- Beat in the egg and vanilla extract until fully combined.
- Gradually add the dry ingredients to the wet mixture on low speed until dough comes together; avoid overmixing.
- Shape dough into a disk, wrap in plastic wrap, and refrigerate for at least 1 hour.
- Preheat oven to 350°F (175°C). Roll dough on a lightly floured surface to ¼ inch (6 mm) thickness.
- Cut dough using a diploma-shaped cookie cutter or rectangle cutter (3 inches by 1.5 inches) and a small circle cutter for the seal.
- Place cookies on parchment-lined baking sheets about 1 inch apart.
- Bake for 10-12 minutes until edges are set but centers remain soft.
- Cool cookies completely on a wire rack before decorating.
- To make royal icing, beat powdered sugar, egg whites, lemon juice, and vanilla extract on medium-high speed until stiff peaks form, about 7-10 minutes.
- Transfer icing to piping bags with small round tips. Outline diploma shapes, flood centers with slightly thinned icing, pipe seal circles and decorations.
- Allow decorated cookies to dry at room temperature for at least 2 hours or overnight for best results.
Notes
Use pasteurized egg whites for safer royal icing. Chill dough well to prevent spreading. Practice piping on parchment paper to build confidence. Avoid high humidity when drying icing to prevent cracking. For gluten-free, substitute almond or oat flour but expect softer cookies. For dairy-free, use vegan margarine or coconut oil instead of butter.
Nutrition
- Serving Size: 1 cookie
- Calories: 150
- Fat: 7
- Carbohydrates: 22
- Protein: 2
Keywords: chocolate cookies, royal icing, diploma cookies, graduation cookies, homemade cookies, decorated cookies, easy cookie recipe