Mix the ground beef with diced red onion, dill pickles, garlic powder, smoked paprika, salt, and pepper in a large bowl. Use your hands gently—don't overwork it or the patties get dense and tough. Divide into 8 equal portions and shape each into a thin patty that fits your slider buns.
Heat olive oil in a large skillet over medium-high heat until it shimmers. You'll know it's ready when a tiny piece of beef sizzles immediately. Working quickly, place all 8 patties into the pan—they should sizzle the moment they touch the skillet.
Cook for about 3 minutes without moving them. This is where that golden crust develops. I always resist the urge to poke them around minute 2—that's the secret to good color.
Flip each patty carefully and cook for another 2 to 3 minutes. Top each one with a small handful of shredded cheddar cheese and let it melt while they finish cooking.
Brush the inside of each slider bun with a little BBQ sauce while the cheese is still melting. You don't need much—just enough for flavor without making everything soggy.
Transfer each cheesy patty onto a bun, pressing down gently so the cheese seals everything together. These crowd pleasing sliders are ready to serve immediately, and they taste best when they're still warm.