1 1/2 sticks melted butter
2 c. powdered sugar
1 1/2 c. graham cracker crumbs
3/4 c. peanut butter

Combine and press above ingredients into a 9 x 11 inch pan. Chill for 45 minutes. After chilled, melt 2-2 1/2 cups melted chocolate chips and pour over chilled mixture. Chill 1/2 hour and cut into bars.