Peanut Butter Truffle Brownies

1 pouch (20 oz) Betty Crocker Hershey's triple chocolate brownie mix + additional ingredients for mix

Topping:

1 c. semisweet chocolate chips

1/4 c. butter

Filling:

1/2 c. butter, softened

1/2 c. creamy peanut butter

2 c. powdered sugar

2 t. milk

Heat oven to 350. Spray bottom only of 9x13 pan. Combine brownie mix with ingredients listed on pouch until well blended. Spread in pan. Bake 27-29 minutes until toothpick inserted 2" from side of pan comes out clean. Cool for 1 hour. Beat filling ingredients on medium speed until smooth. Spread over cooled brownie base. Microwave chocolate chips and butter uncovered on high 30-60 seconds. Stir until smooth. Cool 10 minutes. Spread over filling. Refrigerate 30 minutes until set. Cut into squares. Store in refrigerator.