Heat a large skillet over medium-high heat and spray with cooking spray. Add ground lamb, garlic powder, oregano, salt and cayenne and begin browning lamb. Stir until lamb is fully cooked through and browned, about 7-9 minutes.
Place cooked meat in a medium bowl and add in the hummus. Stir to combine then spread mixture in the bottom of an 8 x 8 baking dish.
Sprinkle dish evenly with crumbled feta and bake until cheese melts and hummus is warmed through, about 15 minutes.
Garnish with optional toppings and serve with pita bread or pita chips.