Chocolate Peanut Butter Marshmallow Squares

1/2 cup butter
1/2 cup peanut butter
12 oz chocolate chips
3 cups miniature marshmallows
Peanut butter chips for topping

Mix butter, peanut butter, and chocolate chips in a double boiler just till melted, then remove from heat. Place 3 cups miniature marshmallows in a buttered pan and spread on warm mixture. Save a few chips and marshmallows to decorate the top, or be generous and add extra. Cut in squares when cool.