Chocolate-Peanut Butter Bars

I know that this recipe is a winner because the pages in my recipe book stick together! If you ever want to find a way to tell Joe "thank you", this is it!

2 1/2 cups graham cracker crumbs (2 sleeves)
2 3/4 cups powdered sugar
1 cup peanut butter (we prefer creamy, but crunchy is good, too)
1 cup melted butter (margarine is not quite the same; if you're going to eat something that is this dense calorically, might as well make it good!)
2 cups semi-sweet chocolate chips

In a medium bowl, stir together the cracker crumbs, sugar, peanut butter and melted butter. It will be a thick consistency. Press it firmly into the bottom of a 9x13-inch pan.
Melt the chocolate chips over a double bouler or in the microwave, stirring occasionally. Spread the melted chocolate over the crumb crust. Chill in the refrigerator for about 5 minutes, then cut into tbars before the top is competely set. Chill the bars until ready to serve.