Mix the above ingredients until crumbly as you would for a pie crust and press into the bottom of an oblong baking pan (6x9 inches).
Bake at 350 fro 20 minutes
Remove from oven, Set aside and prepare topping.
TOPPING
Mix to combine and pour over the baked crumbs.
Return to the oven and bake 20 minutes longer.
When cool, sprinkle with powdered sugar and cut in squares.