1In a large bowl, combine the ground lamb, garlic powder, salt, and black pepper. Mix until well combined.
Finely chop the fresh mint leaves and add them to the lamb mixture. Mix again to incorporate the mint evenly.
Divide the lamb mixture into 8 equal portions and shape each portion into a small patty.
Heat the olive oil in a large skillet over medium-high heat. Once hot, add the lamb patties and cook for about 3-4 minutes on each side, or until they are cooked to your desired level of doneness.
While the patties are cooking, slice the slider buns in half and lightly toast them.
Once the patties are cooked, place each one on the bottom half of a slider bun.
Top each patty with a spoonful of tzatziki sauce and a sprinkle of feta cheese.
Place the top half of the slider bun on each patty and serve immediately.