In bowl, mix lamb, feta, chopped mint, onion, garlic, oregano, salt and pepper. Form into 8 meatballs. In medium nonstick skillet, heat EVOO over medium-high. Add meatballs; cook until browned all over, 7 to 8 minutes. Reduce heat to medium- low; cook meatballs to desired doneness, turning often, 3 to 4 minutes more for medium. Build sliders with buns, cucumber slices, meatballs, tzatziki and mint leaves.
