1 c. butter, melted
2 c. sugar
2/3 c. cocoa
2 eggs
3 tsp. vanilla extract
1 (12 oz.) pkg. semi-sweet chocolate chips
1 can sweetened condensed milk (not evaporated milk)
1 c. flour, unsifted
1/2 tsp. baking powder
1/2 c. milk
1 c. shelled walnuts, chopped

Preheat oven to 350 degrees. In large bowl combine butter, sugar, flour, cocoa, baking powder, eggs, milk and 1 1/2 teaspoons vanilla. Beat well. Stir in walnuts.

Spread in greased 13x9 inch baking pan. Bake 40 minutes or until brownies begin to pull away from sides of pan. Just before brownies are done, in heavy saucepan melt chips with sweetened condensed milk and remaining vanilla. Immediately spread over hot brownies. Cool and cut into bars.