2 boxes of plain brownie mix
1 tub of white frosting
1 pkg of Oreo cookies (not double stuff)
Make brownies according to directions on box. Pour onto a large cookie sheet w/deep sides. Let cool completely.
Spread frosting on cooled brownies.
Crumble Oreos on top of frosting and gently press in.
Cut into squares. I use a pizza cutter.
They keep nicely in a zip-lock bag.