Preheat oven to 350 degrees.

Make crust: In a medium-size bowl, combine flour and sugar. Using a pastry blender or two knives, cut butter into mixture until it resembles coarse crumbs. Turn mixture into a greased 9 X 9 inch pan, and press with fingers evenly over bottom of pan. Bake for 15 minutes.

Meanwhile, make topping: Combine all remaining ingredients, except confectioner's sugar, in a medium-size bowl; mix until well-blended. When crust is done, pour topping over crust, and bake for another 20 minutes.

Let cool, then sprinkle with confectioner's sugar, and cut into 2 1/4 by 3 inch bars.