Pineapple Pie

1 graham cracker crust
1/2 C butter
2 C powdered sugar
1-1/2 C graham cracker crumbs
1-1/2 C Cool Whip
1-1/2 C crushed pineapple, well-drained
Beat the butter and powdered sugar together and spread in the pie crust. Gently combine the Cool Whip with the pineapple and spread it over the butter-sugar mixture. Top with graham cracker crumbs and serve chilled.