Lemon Cookies

Name: Lemon Cookies
Ingredients: 1 1/2 cups (177g) King Arthur Unbleached All-P; 1 teaspoon cornstarch; 1 teaspoon baking powder; 1/2 teaspoon salt; 2 tablespoons (14g) lemon juice powder*; 8 tablespoons (113g) unsalted butter at room temperature; 1/2 cup (99g) granulated sugar; 1/4 cup (53g) light brown sugar; 1 tablespoon grated lemon rind (lemon zest); 1/2 teaspoon vanilla extract; 1/2 teaspoon lemon extract optional for enhanced lemon flavor; 1 large egg