Heat a medium skillet over medium-high heat and spray with cooking spray. Cook ground lamb until browned, about 10 minutes, sprinkling with salt and pepper to taste. Place on a plate lined with paper towel to slightly drain.
While lamb is cooking, spread hummus in a thin layer on a serving platter. Remove lamb from paper towel lined plate and sprinkle on top of hummus. Top with all remaining toppings and serve with pita bread.