In a small bowl, mix the ground coffee, smoked paprika, garlic powder, onion powder, salt, and pepper.

Place the ground beef in a large bowl. Add the spice mixture and Worcestershire sauce. Gently combine with your hands—don't overwork the meat.

Divide the beef into 8 equal portions. Shape each into a thin patty, about 1/2 inch thick. Press a small indent in the center of each patty to prevent puffing.

Heat a griddle or large skillet over medium-high heat. Add the patties and cook for 3 minutes without moving them. Flip, then top each with a half-slice of cheese. Cook another 2-3 minutes for medium doneness.

While the patties cook, brush the cut sides of the slider buns with melted butter. Toast them on the griddle or in a separate pan until golden, about 1 minute.

Assemble the sliders: place a patty on each bun bottom, add toppings as desired, and cap with the bun top. Serve immediately.