These were Shannon's find, and delicious. Just make sure you don't overcook the brownies in the first step... apparently I can bake some fairly complicated things, but I can't manage to make out-of-the-box brownies without burning them. Oops.
19-1/2 oz. pkg. brownie mix
2 c. powdered sugar
1/2 c. plus 6 T butter, softened and divided
8 oz. creamy peanut butter
6 oz. (approximately) semi-sweet chocolate chips [I used the Ghiardelli dark chocolate baking chips, and I think they're the best]
Prepare and bake brownie mix in a greased 13" x 9" pan, according to the directions. Let cool.
With a mixer, combine powdered sugar, 1/2 cup butter and peanut butter. Mix well and spread over cooled brownies. Chill for one hour.
Melt together chocolate chips and 6 T butter in a saucepan over low heat, stirring occasionally. Spread over brownies. Let cool; cut into squares. Makes 2 to 3 dozen.