Hanging A Wall hung Corner Shelf?

How do you hang a wall hung corner shelf. I don't want to use the two loops, one on the top of each side, but want something hidden. I want the shelf to be flush to the walls on either side, something like when you use a keyhole bit. With a keyhole bit, one side goes over the screw head but the other side is too far away from the wall to hook. Suggestions?

George

kerf the edges and slide it onto small pieces of aluminum angle screwed to the studs....02 tod

I usually make a blind ledger and dado the edge if there is enough thickness...otherwise Tod has a great solution that is similar

I use a french cleat on corner cabinets.