Follow these straightforward steps to create your Mini Big Mac Cheeseburgers:

1. Make the Special Sauce: In a bowl, mix together the mayonnaise, ketchup, yellow mustard, vinegar, sugar, and a hint of salt. Stir well and set aside.
2. Form the Patties: Form the ground beef into small, even patties. Aim for about 1.5 ounces each. Season both sides with salt and pepper.
3. Preheat the Grill or Skillet: Heat your grill or skillet over medium-high heat.
4. Cook the Patties: Place the patties on the hot grill or skillet. Cook for about 2-3 minutes on each side until the burgers are nicely browned and cooked through.
5. Add Cheese: In the last minute of cooking, place half a slice of American cheese on each patty. Cover to melt the cheese.
6. Toast the Buns: In a separate skillet or on the grill, lightly toast the slider buns for a minute or until golden brown.
7. Assemble the Burgers: Start with the bottom bun, add a patty with melted cheese, then a layer of lettuce, a few pickles, diced onions, and a generous spoonful of special sauce. Top with the crown of the bun.
8. Repeat: Continue assembling the remaining burgers until all patties are served.
9. Enjoy!: Serve immediately while warm and delicious!