Rosemary-Lemon Shortbread
["1 c. all-purpose flour", "1/2 c. confectioners sugar", "1/2 c. low-fat margarine", "1/4 c. cornstarch", "2 Tbsp. rosemary, dried", "1 egg yolk", "1 tsp. grated lemon rind", "1/4 tsp. salt"]
["Preheat oven to 325\u00b0.", "Line 9 x 9 x 2-inch square baking pan with aluminum foil.", "Coat with nonstick vegetable oil cooking spray."]
["flour", "confectioners sugar", "low-fat margarine", "cornstarch", "rosemary", "egg yolk", "lemon rind", "salt"]