Melt butter in a heavy 4 quart saucepan over low heat; stir in sweetened condensed milk and milk. Add all morsels, stirring constantly, until mixture is smooth. Remove from heat; stir in marshmallow cream and flavorings. Stir in walnuts. Pour into a buttered 15" x 12" pan or two 9" x9" pans. Chill. Cut into squares. Store in refrigerator. Yield: 5 pounds