Cookie Cake

Directions

• Preheat oven to 350°. Line the bottom of a 9-in. springform pan with parchment. In a large bowl, cream butter and sugars until light and fluffy, 5-7 minutes. Beat in egg, egg yolk and vanilla. In another bowl, whisk flour, cornstarch, baking soda and salt; gradually beat into creamed mixture. Stir in chips. Press onto the bottom of prepared pan.
• Bake until golden brown, 20-25 minutes. Cool on a wire rack 10 minutes. Loosen sides from pan with a knife; cool completely. Remove rim from pan. Carefully remove cookie cake from bottom pan; transfer to serving platter.
• In a large bowl, beat butter, confectioners’ sugar, vanilla and enough milk to reach piping consistency. If desired, beat in food coloring. Pipe around edge of cookie cake. If desired, garnish with sprinkles.