Caramel Chocolate pecan bars

Crust:
2 c. all purpose flour
1 c. firmly packed brown sugar
1/2 c butter or margarine,softened
1 c. pecan halves

Caramel:
2/3 cup butter or margarine
1/2 c firmly packed brown sugar
1 c. semi-sweet chocolate chips

Heat oven to 350. In large mixer bowl combine all crust ingredients except the pecans. Beat at medium speed. make sure you scrap the sides of the bowl often. mix until well combined and particles are fine about 2 to 3 minutes. Press on bottom of a 13 x 9 inch baking pan. Sprinkle pecans evenly over the unbaked crust. In a 1 quart saucepan combine 2/3 cup butter and 1/2 brown sugar.Cook over medium heat stirring constantly until mixture comes to a full boil. Boil stirring constantly until small amounts of mixture dropped into ice water form a firm ball or with a candy thermometer reaches 242 degrees F. Pour evenly over the pecans and crust. Bake for 18 to 22 minutes or until entire caramel layer is bubbly. Remove and Immediately sprinkle the top with chocolate chips allow them to melt slightly and swirl chips leaving some whole for a marbled look..Let cool completely before cutting into pieces..Great for gifts..very yummy and very easy to make..