Chocolate Glazed Popcorn Squares

1 package microwave popcorn, popped
2 tablespoons butter
10 1/2 ounces miniature marshmallows
1/4 cup chocolate ready-to-spread frosting
1/2 cup salted peanuts

Chocolate Glaze:
1/3 cup chocolate ready-to-spread frosting

Grease a 9 x 13-inch pan.

Remove and discard unpopped kernels from popcorn.

Place butter in 4-quart microwavable bowl. Microwave, uncovered, on HIGH, for about 30 seconds, or until melted. Stir in marshmallows and frosting until marshmallows are coated. Microwave, uncovered, 2-3 minutes, stirring every minute, just until mixture is smooth. Fold in peanuts and popcorn until coated. Press mixture into pan. Spread with chocolate glaze; cool. Cut into bars.

Chocolate Glaze: Place ready to spread frosting in small microwavable bowl. Microwave, on HIGH, about 30 seconds or until just melted.