1 (9 inch) unbaked pastry shell
1 ( 6 oz.) package semi-sweet chocolate chips
1/4 cup butter
1 (14 oz.) can sweetned condensed milk
1/2 cup biscuit baking mix
1 tsp. vanilla extract
1 cup chopped nuts
Preheat oven to 375 degrees. Bake pastry shell 10 minutes; remove from oven. Reduce oven temperture to 325 degrees. In saucepan, over low heat, melt chips with butter. In large mixer bowl, beat chocolate mixture with remaining ingredients except nuts until smooth. Add nuts. Pour into prepared pastry shell. Bake 35 to 40 minutes or until center is set. Cool slightly. Serve with ice cream. Refrigerate leftovers.