1Heat oven to 350°F. Grease bottom and sides of 13x9-inch pan with shortening or cooking spray. In large bowl, mix 2 cups flour, the brown sugar and butter with fork until crumbly. Press firmly in bottom of pan.
2In same bowl, mix filling ingredients. Spoon onto crust; spread evenly.
3Bake 25 to 30 minutes or until lightly browned. Cool completely, about 45 minutes. For squares, cut into 8 rows by 6 rows.