Make crust of 1 cup of flour, 1/2 cup butter and 1/2 chopped nuts. Pat into 9 x 13 inch pan. Bake 15 minutes in 350 degree oven. Cool.

Filling: Blend 8 ounce cream cheese and 1 cup powdered sugar until smooth. Fold in 1/2 large carton Cool Whip. Spread on cooled crust. Top with 1 can lemon filling (or prepare 1 large package lemon pudding mix and cool). Top with remaining Cool Whip. Sprinkle with additional chopped nuts if desired.