In a small bowl, whisk together the Greek yogurt, lemon juice, half of the dried oregano, and a pinch of garlic powder to create the dressing.
Place a non-stick skillet over medium-high heat. Add the ground lamb, breaking it up with a spatula.
Season the lamb with the remaining oregano, garlic powder, sea salt, and black pepper. Cook until browned and cooked through, about 5-7 minutes.
Stir the rinsed and drained chickpeas into the skillet with the lamb for the last 2 minutes of cooking to warm them through and absorb the juices.
While the lamb cooks, dice the cucumber, halve the cherry tomatoes, and finely mince the red onion. Toss them together in a small bowl with the fresh parsley.
Place the baby spinach in a large serving bowl. Top with the warm lamb and chickpea mixture.
Add the cucumber and tomato salad to the bowl and drizzle the lemon-yogurt sauce over the top before serving.