Lemon Chess Bars
["2 c. plain flour", "2 sticks softened margarine", "1/2 c. confectioners sugar"]
["Mix well.", "Press into a greased 9 x 13-inch pan.", "Bake at 350\u00b0 for 15 to 20 minutes or until lightly browned."]
["flour", "margarine", "confectioners sugar"]