Preheat the oven to 375°F (190°C).
In a large bowl, combine the ground lamb, 4 tbsp parsley, mint, jalapeño (if using), onion, garlic, cumin, paprika, coriander, ginger, salt, and pepper. Mix gently with your hands until just combined. Do not overmix.
Pour the 1 tbsp of olive oil into a large cast iron skillet (or a parchment lined baking sheet).
Using a small scoop (about 2 tablespoons), form the mixture into balls and place them in the skillet. You should have about 18-20 meatballs.
Place the skillet in the oven and bake for 15-20 minutes, turning the meatballs halfway through, until they are browned and reach an internal temperature of 160°F.
Remove from the oven, garnish with additional fresh parsley, and serve.