Gluten-Free Peanut Butter Chocolate Chip Bars with Chocolate Frosting

Heat oven to 350°F (325°F for dark or nonstick pan). Grease bottom only of (8- or 9-inch) square pan.

In medium bowl, stir together cookie mix, butter, peanut butter, vanilla and egg with spoon until soft dough forms (dough will be crumbly). Pat dough into pan. Bake 18 to 22 minutes or until edges are dry and golden brown. Run knife around inside edge of pan. Cool on wire rack about 1 hour.

Spread frosting over bars. Cut into squares, 4 rows by 4 rows.