Goober Frosted Brownies

1 package brownie mix
1 cup peanut butter chips
½ cup butter (margarine)
1 (14 ounce) can sweetened condensed milk.

Bake brownies according the package directions. Cool.

In a medium saucepan over low heat, melt peanut butter chips and butter together, stirring frequently until smooth. Remove from heat and stir in sweetened condensed milk. Spread evenly over the cooled brownies. Chill until set and cut into squares.