1 cup all-purpose flour
1/2 cup sifted confectioners' sugar
1/2 cup butter or margarine, softened
1 cup sugar
1/4 cup all-purpose flour
3/4 teaspoon baking powder
2 large eggs, beaten
3 cups diced rhubarb

Combine the 1 cup flour and confectioners' sugar; cut in butter with pastry blender until mixture resembles coarse meal. Press mixture evenly into a lightly greased 13 x 9-inch pan. Bake at 350 degrees F for 12 minutes.

Combine sugar, 1/4 cup flour, and baking powder. Add eggs, and mix well. Stir in rhubarb, and pour over prepared crust. Bake at 325 degrees F for 45 to 50 minutes. Cool and cut into squares.