2 1/2 c. sugar
1 c. evaporated milk
1/4 c. butter
1/4 tsp. salt
1 tsp. vanilla
1 c. semi-sweet chocolate chips
1 c. milk chocolate chips

Combine first 4 ingredients in a saucepan. Bring to a full rolling boil over medium heat, stirring constantly. Boil 6 minutes over heat, stirring occasionally. Remove from heat. Stir in miniature marshmallows and vanilla and stir until marshmallows melt and mixture is well blended. Remove 2 cups of hot mixture and add semi-sweet chocolate chips. Stir until chips are melted and mixture is well blended. Pour evenly into a greased 8-inch saucepan. To the remaining hot mixture, add milk chocolate chips. Stir until chips are melted and mixture is well blended. Spread evenly over semi-sweet mixture in pan. Chill until firm (about 4 hours).

Makes about 2 3/4 pounds.

You can add 1/4 to 1/3 cup chopped walnuts to each mixture right before you put it into the 8-inch pan.