Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the ground beef and onion soup mix.
Form the beef mixture into 12 small patties, with slight indentation in the center.
Heat a skillet over medium-high heat and cook the patties for about 3-4 minutes per side.
Place the cooked patties on the bottom half of the slider buns.
Top each patty with a slice of American cheese.
Spread shredded lettuce and diced pickles over the cheese.
Drizzle each slider with special sauce before placing the top bun.
Cover the assembled sliders with the top halves of the buns.
Wrap the whole assembly in aluminum foil and bake for 10-15 minutes.
Remove from the oven, slice into individual sliders, and serve immediately.