01 - Preheat a grill or skillet over medium-high heat.
02 - In a bowl, gently combine ground beef with salt, black pepper, and garlic powder without overworking the meat.
03 - Divide the mixture into 8 equal portions and shape each into a small patty slightly larger than the slider buns, as they will shrink during cooking.
04 - Brush the cut sides of the slider buns with melted butter, then toast them cut side down on the grill or skillet until golden. Set aside.
05 - Place beef patties on the grill or skillet and cook for 2 to 3 minutes per side until reaching preferred doneness.
06 - During the last minute of cooking, top each patty with a slice of cheese and cover to allow it to melt.
07 - Place a cheesy patty on each bottom bun, top with dill pickle slices and optional onion, then add ketchup and mustard if desired.
08 - Cover sliders with the top buns and serve immediately.