Sugar Cookie Bars – ▢ 1 cup butter  – ▢ 1  cup sugar – ▢ 2 large eggs  – ▢ 1 tablespoon vanilla extract – ▢ 1 teaspoon baking powder – ▢ 1 tablespoon cornstarch – ▢ 2 ¼ cups all-purpose flour Peppermint Buttercream Frosting – ▢ ½ cup butter – ▢ ½ teaspoon peppermint extract (or vanilla extract) – ▢ ¼ cup heavy whipping cream – ▢ 2¼ cups confectioners sugar – ▢ ¼ cup candy canes