1. Preheat grill for 15 minutes.
2. Season ground beef with salt and pepper to taste. Form into 8 mini patties.
3. Grill over medium-high heat for about 7 minutes, turning once, until sliders are well browned and a meat thermometer inserted into each patty registers 160°F for medium or 170°F for medium well.
4. Add cheese to sliders and let melt. Grill buns for about 20 seconds.
5. Serve burgers in buns, topped with marinara sauce and basil leaves.