For some reason the most stressful thing for me about making cheeseburgers is when to add the darn cheese! Usually I add mine about 3/4 of the way through and put a lid over my grill pan (I can't have a legit grill at my apartment). My NEW and AWESOME way of making the burgers is to put the cheese in it, not on it. Because of this I needed more hamburger than usual, since there needs to be enough meat to encase the queso. To assemble the cheeseburgers I make each individual future cheeseburger into two balls of meat (two cheeseburgers= four burger balls). Flatten each of the burger balls and place your desired cheese (I did the classic American) on a flattened burger. Place the other burger half on top of the cheese and pinch down around the edges so that the cheese won't ooze out all over when you're cooking it. Set aside in the fridge for awhile (~10-15 minutes) so allow the cheeseburger to become one. Grill/pan grill on each side until done!