- In a 12-inch skillet, melt the butter along with the vegetable oil over medium heat. With the help of a large spatula, carefully transfer the patties to the skillet with the onion side facing down. Cook them for 6-8 minutes until the onions become a deep golden brown and start to crisp around the edges. Flip the burgers, then increase the heat to high and cook for about 2 more minutes, or until well browned on the second side.
- Add 1 or 2 slices of American cheese to each burger and allow it to melt. Meanwhile, spread mayo, mustard, and pickles on the top buns. Once the cheese has melted, place each burger on the bottom buns. Serve immediately.
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