Bake for 15 minutes. Remove and stir cubes. I usually just toss with my hands, but you have to be careful not to burn yourself. Place cubes back in the oven and bake for another 15 minutes. If no more softness remains, and cubes are crunchy, they're done. If not, bake for another 5 minutes or more until they are done. Check periodically to make sure they don't burn. If you want stuffing cubes, stop here.