Creating the Copycat Shake Shack Burger is easy when you follow these steps:

1. Prepare the Sauce: In a bowl, combine mayonnaise, ketchup, yellow mustard, and pickle relish. Mix well and set aside.
2. Form the Patties: Divide the ground beef into four equal portions. Gently shape them into patties, about 3/4 inch thick. Make an indentation in the center of each patty to prevent puffing during cooking.
3. Season the Patties: Generously season both sides of each patty with salt and pepper.
4. Preheat the Grill or Pan: Heat a grill or a skillet over medium-high heat. If using a skillet, add a small amount of oil to the pan.
5. Cook the Patties: Place the patties on the grill or skillet. Cook for about 3-4 minutes on one side. Flip the patties and immediately place a slice of cheese on top of each one.
6. Add the Buns: While the patties cook, place the burger buns cut-side down on the grill or skillet to toast lightly.
7. Check for Doneness: Cook the patties for an additional 2-3 minutes, or until they reach your desired doneness (medium-rare to medium).
8. Assemble the Burgers: Spread the prepared sauce on the bottom bun. Layer with shredded lettuce, a slice of tomato, and the cheesy patty. Top with the other half of the bun.
9. Serve Immediately: Enjoy your Copycat Shake Shack Burgers while they’re hot and fresh.