1 3/4 c. flour
3/4 c. powdered sugar
1/4 c. (unsweetened) cocoa
1 c. cold butter
2 c. semi-sweet chocolate chips, divided
1 (14 oz.) can sweetened condensed milk
1 tsp. vanilla extract
1 c. chopped nuts

Heat oven to 350 degrees. In medium bowl, stir together flour, sugar and cocoa; cut in butter until crumbly. press firmly on bottom of 13 x 9 inch baking pan. Bake 15 minutes.

Meanwhile, in a medium saucepan, combine 1 cup chocolate chips, sweetened condensed milk and vanilla. Cook over medium heat, stirring constantly, until chips are melted.

Pour evenly over prepared crust. Top with nuts and remaining 1 cup chocolate chips; press down firmly. Bake 20 minutes or until set. Cool in pan on wire rack. Refrigerate if desired. Cut into bars. Store tightly covered.