Spread butter or mayonnaise on both sides of four buns and set aside.
Add the first 7 ingredients to a large mixing bowl. Mix until just combined, careful not to over mix the ingredients. Form four patties.
Preheat cast iron skillet over medium high heat. Place patties into heated pan and cook for 4-6 minutes per side, depending upon the thickness of the burgers. Add the cheese after you flip the burgers the first time.
Grill the buns either in the skillet or on a griddle.
Serve the burgers with your favorite toppings immediately.
Notes
To keep your burger from falling apart, be sure to COOK them straight from the fridge.
Put a small indention into the middle of the burger. This keeps the meat from pulling up and will keep your burger flat for better stacking of the toppings.
It’s best not to flatten the burger with your spatula. This causes all the juices to spill out of the burger.
Because of the high fat content, it’s a good idea to keep a spray bottle out at your grill to keep the flames down.
Let the cheese melt fully. If you are using a propane grill, turn it off and let the cheese get melted to perfection.