1 (9 inch) unbaked pastry shell
1 c. Hershey's semi-sweet chocolate chips
1/4 c. butter
1 (14 oz.) can condensed milk (not evaporated)
1/2 c. all-purpose biscuit mix
2 eggs
1 tsp. vanilla
1 c. chopped nuts

Heat oven to 375 degrees. Bake pastry shell for 10 minutes. Remove from oven. Reduce oven temperature to 325 degrees. In saucepan, over very low heat, melt chocolate chips with butter. In large mixing bowl, beat chocolate mixture with remaining ingredients, except nuts, until smooth. Stir in nuts. Pour into prepared pastry shell. Bake for 35 to 45 minutes or until center is set. Cool. Serve with ice cream or whipped cream, if desired.