Crust:

2 c. all-purpose flour
1 c. firmly packed brown sugar
1/2 c. (1 stick) butter, softened
1 c. whole pecan pieces

Caramel Layer:

2/3 c. butter
1/2 c. firmly packed brown sugar
1 c. milk chocolate chips

Heat oven to 350°F. In large bowl combine all crust ingredients except pecans. Beat at medium speed until well mixed and particles are fine (2 to 3 minutes). Press on bottom of 13x9-inch pan. Sprinkle pecans evenly over unbaked crust. In 1-quart saucepan combine butter and brown sugar. Cook over medium heat, stirring constantly, until entire surface of mixture begins to boil. Boil 1 minute stirring constantly. Pour evenly over pecans and crust.

Bake 18 to 22 minutes or until entire caramel layer is bubbly. Remove from oven and sprinkle with chocolate chips. Swirl chips, leaving some whole. Cool completely. Cut into bars.