Recipe(tried): Colored Mallow Squares

I've made this recipe and like it. It's definitely for a sweet tooth.

COLORED MALLOW SQUARES
Source: Chocolate Everything (Company's Coming) by Jean Pare

6 Tbsp margarine
3/4 cup semi-sweet chocolate chips
3/4 cup peanut butter chips
1/4 cup smooth peanut butter
5 cups colored mini marshmallows, lightly packed

Melt margarine in large saucepan. Add both chips and peanut butter. Heat on low, stirring often, until smooth. Remove from heat.

Add marshmallows. Stir well to coat. Press in ungreased or foil-lined 9x9-inch (22x22cm) pan. Chill.

Cut into 36 squares