Peanut Butter Fudge

1 1/2 sticks margarine

2/3 cup evaporated milk or milk

3 cups sugar

1 10 ounce bag miniature marshmallows

2/3 cup peanut butter

Cook margarine, milk and sugar for 5 minutes or until soft ball stage. Remove from heat. Add marshmallows. Beat until dissolved. Add peanut butter. Pour onto baking dish. Let cool and cut.