Classic Hamburger with Secret Sauce

You can either do quarter pound patties or half a pound patties. If doing quarter pound patties, then you will have 8 patties. If doing half pound patties, then you will have 4 patties.
When I make them for my family, I do quarter pound patties for the kids and half a pound patties for the adults, so the adults can load up on their protein.
Form the patty by slapping it into one hand and start shaping it with the other.
In a skillet on medium heat, add butter and oil. Season beef patties with salt and pepper on both sides, then add patties to the skillet. Make sure you do not press down on the patties as that will release all of the lovely juice.
Cook for 4 minutes on each side if doing quarter pound patties, and 6 minutes on each side for half pound patties.
Place a slice of cheese on each beef patty 1 minute before they're done.
After the patties are done, place on plate and cover loosely with tin foil to keep them warm.
In the same skillet, turn heat to medium high and add your sliced onions. Cook for 5 minutes, stirring often. Note: If your pan is large enough, you can add the onions while you are cooking the patties. You want to cook the onions so they are nice and soft and caramelize.
When adding the toppings, make sure to add the toppings on the bottom bun, and then add your patty on top. This way it holds those toppings in place by the patty weighing down on them.