Marshmallow Balls

3 MacIntosh toffee bars
1/2 cup condensed milk, sweetened
1/2 cup butter
1 package large marshmallows

In microwave melt toffee bars. Add condensed milk and margarine, stir until smooth. Dip large marshmallows into cooled mixture one at a time and roll in rice krispies. Keep in a sealed container in the refrigerator.