The challenge with any stuffed burger is keeping the contents in place while the meat constricts as it cooks. Hand-pressing two separate patties, then sealing them together works OK, but they're messy to make and can still result in blow-outs. There are a number of devices on the market to make this process easier, including the Stuff-a-Burger Press. Just press an even layer of about one-third to one-half pound of ground meat into form, then push the smaller side of the lid into the patty to make a well for your cheese or other fillings. Add the fillings, top with an additional quarter-pound of meat, flip the lid, and press the meat into a thick patty.