Double chocolate Brownie Bars

2/3 cup sweetenned condensed milk
1 (6 oz) pkg semisweet chocolate pieces
1/4 tsp salt
1 tsp vanilla
1 roll refrigerated chocolate chip cookie dough
In small saucepan over low heat stir together sweetened condensed milk, chocolate pieces and 1/4 tsp salt til smooth. Remove from heat; add vanilla. Pat two-thirds of cookie dough over bottom of ungreased 9x9 inch baking pan. Spread chcocolate over dough. Dot with remaining cookie dough. Bake in 350 degree oven for 30-35 minutes. Makes 2 dozen bars