Peanut Butter Brownies

These are such good brownies! And they're really easy to make since you use a box of mix. ;)

Rating: ****
Difficulty: Easy

1 box brownie mix
water, vegetable oil, and egg called for on box

Filling:
1/3c butter, softened
1/3c creamy peanut butter
1 1/3c powdered sugar
1 1/2tsp milk

Topping:
3/4c semisweet chocolate chips
3T butter

Heat oven to 350 degrees. Grease bottom only of 8 or 9in pan with cooking spray or shortening. Make brownies as directed on box. Cool completely, about 1 hour. In medium bowl, beat filling ingredients with electric mixer on medium speed until smooth. Spread mixture evenly over brownie base. In small microwaveable bowl, microwave topping ingredients uncovered on high 30-60 seconds; stir until smooth. Cool 10 minutes; spread over filling. Refrigerate about 30 minutes or until set. Cut and serve. Store covered in refrigerator.