Crust
4 cups all-purpose flour
2 cups packed brown sugar
1 cup softened butter
2 cups pecan halves or pieces

Caramel
1 1/2 cups butter
1 cup brown sugar
2 cups semisweet chocolate chips

Preheat oven to 350 degrees F.

Crust: Combine flour, sugar and butter. Mix well. Pat firmly into a 9 x 13-inch pan. Sprinkle pecans on top.

Caramel layer: In a heavy saucepan over medium heat, cook butter and sugar, stirring constantly. Boil 1/2 to 1 minute. Pour evenly over crust. Bake for 22 to 25 minutes or until layer is bubbly. Remove from oven and immediately sprinkle chocolate chips over top. Allow to melt 2 to 3 minutes. Stir slightly to marbleize. Cool completely (several hours or overnight) before cutting.

Makes 3 to 4 dozen bars.