Peanut Butter Brownies

Ingredients
1 box brownies
1/2 cups peanut butter
3/4 cup butter, separated 
2 cups powdered sugar 
2 teaspoons milk
1 teaspoon vanilla extract
1 cup semisweet chocolate chips

Notes / Directions
Make brownies according to box and cool. In a bowl, mix peanut butter, 1/2 c. butter, powdered sugar, and vanilla; spread over brownies. In a small sauce pan, melt 1/4 c. butter with chocolate chips over low heat; spread over peanut butter and refrigerate for 1 hour. Cut and store layered with waxed paper in refrigerator.