In a 12-inch skillet, melt the butter with the vegetable oil over medium heat. Carefully slide the patties, using a large spatula, into the skillet onion side down. Cook them for 6-8 minutes until the onions are a rich golden brown and beginning to brown around the edges. Flip the burgers, then raise the heat to high and cook for another 2 minutes or so, or until very browned on the second side.
Top each burger with 1 slice or 2 slices of American cheese and melt it. Spread mayo, mustard and pickles on the top buns, meantime. When the cheese is nice and gooey, stack each burger onto the bottom half of the buns. Serve immediately.
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