1 (12 oz.) semi-sweet chocolate chips
1/4 c. butter
2 c. biscuit baking mix
1 (14 oz.) sweetened condensed milk
1 egg, beaten
1 tsp. vanilla extract
1 to 1 1/2 c. coarsely chopped walnuts
Powdered sugar

Preheat oven to 350 degrees. In large saucepan over low heat, melt 1 cup of chocolate chips with butter; remove from heat. Add biscuit mix, sweetened condensed milk, egg and vanilla. Stir in nuts and remaining chocolate chips. Pour into well greased 13x9 pan. Bake 20 to 25 minutes or until brownies pull away from pan. Cool. Sprinkle with powdered sugar.