Pistachio or Chocolate Cream Cheese Dessert

1 stick butter
1 cup flour
2 Tbsp powdered sugar
1/2 cup chopped nuts
1 pkg (8 oz) cream cheese
1 cup powdered sugar
1 large container Cool Whip
2 pkgs instant pudding
2 1/2 cups cold milk

Melt butter and place in 9x13 pan.  Sprinkle with mixture of flour and powdered sugar.  Pat on bottom pan with a cold, wet hand.  Sprinkle with nuts.  Bake at 350 for 15 minutes.  Cool.  Blend cream cheese, powdered sugar till smooth.  Mix with half of Cool Whip.  Spread over crust.  Prepare pudding according to package directions BUT with the amount of milk on the recipe, NOT the package.  Spread over cream cheese layer.  Cover with rest of Cool Whip.  Top with chopped nuts.  Refrigerate.