Peanut Butter and Chocolate Truffles

1 C peanut butter chips 3/4 C butter 1/2 cup cocoa 1 can (14 oz) sweetened condensed milk 1 tablespoon vanilla
Coatings: crushed graham cracker crumbs, confectioners sugar or crushed nuts

Makes about 3 dozen truffles
In a heavy saucepan, over low heat, melt chips with butter. Stir in cocoa until smooth. Add condensed milk and vanilla. Cook and stir until thickened and well blended, about 4 minutes. Remove from heat. Chill until firm enough to handle. Shape into 1 inch balls. Roll in desired coating. Chill until firm. Store, covered in refrigerator