Cookie Cake Recipe: How to Make It

Ingredients

• 3/4 cup butter, softened
• 1/2 cup sugar
• 1/2 cup packed brown sugar
• 1 large egg plus 1 large egg yolk, room temperature
• 2 teaspoons vanilla extract
• 2 cups all-purpose flour
• 2 teaspoons cornstarch
• 1 teaspoon baking soda
• 1/4 teaspoon salt
• 1 cup semisweet chocolate chips
• FROSTING:
• 1/2 cup butter, softened
• 4-1/2 cups confectioners' sugar
• 1-1/2 teaspoons vanilla extract
• 5 to 6 tablespoons 2% milk
• Optional: Food coloring and sprinkles