Make the Special Sauce: In a small bowl, mix the mayonnaise, ketchup, mustard, chopped pickles, salt, and pepper. Stir until smooth and well blended. Adjust the seasoning to taste, ensuring the flavor is balanced between tangy, creamy, and slightly sweet. Let the sauce rest while prepping the burgers so the flavors meld together.
Form and Season Patties: Divide the ground beef into 8 equal portions and shape them into thin patties. Press gently to keep the patties uniform in thickness, which helps them cook evenly. Season each side generously with salt and black pepper right before cooking to enhance the meat’s natural flavor.
Cook the Patties: Heat a skillet or grill over medium-high heat until hot. Cook each patty for 2–3 minutes per side, allowing a deep golden crust to form. After flipping, immediately add a slice of cheese so it melts fully as the second side finishes cooking. The cheese should turn glossy and begin to drape over the edges of the patty.
Assemble the Stacked Burger: Spread a layer of special sauce on the bottom bun. Place a cheesy patty on top, followed by lettuce, tomato, pickles, and red onion. Add a second cheesy patty and another light layer of sauce. For added richness, tuck in crispy bacon if desired. Repeat for each burger, assembling carefully to maintain the stack.
Serve: Add the top bun to each burger. If the stack is tall, secure it with a skewer to help hold everything together. Serve immediately while the cheese is hot and melty.
