c("Combine flour and powdered sugar; cut in butter until mixture resembles coarse crumbs.", "Press into the bottom of a greased 11-inch x 7-inch x 2-inch baking pan.", "Bake at 350 degrees F for 12 minutes.", "For filling, combine the first four ingredients in a bowl.", "Stir in rhubarb; pour over a warm crust. Bake at 350 F for 35-40 minutes or until wooden pick inserted in center comes out clean.", "Cool on wire rack.", "Serve warm if desired.", "Store in refrigerator.")