Preheat the oven to 425 degrees F. Line a baking sheet with parchment paper and set aside.
In a large mixing bowl, place 1 lb ground lamb, ½ cup finely chopped onion, ¼ cup panko breadcrumbs, 3 cloves of minced garlic, ½ teaspoon ground cumin, ½ teaspoon ground coriander, ½ teaspoon kosher salt, ¼ teaspoon black pepper, 1 large egg, 2 teaspoons lemon zest, ⅓ cup crumbled feta cheese, and 2 tablespoons finely chopped fresh parsley.
Using your hands or a large spoon, mix everything until all ingredients are well combined.
Scoop about 1 ½ to 2 tablespoons of the mixture (a small cookie scoop works beautifully here ), coat your hands with a small amount of olive oil, and roll it into a ball.
Repeat this process for the rest of the meat.
Place the meatballs on the prepared baking sheet, spacing them evenly (about an inch) apart. You should end up with approximately 18-22 meatballs.
Bake 10-12 minutes or until the meatballs are lightly browned and a meatball inserted with a meat thermometer registers 160 degrees F. (71 C)
If desired, during the last 2 minutes of baking, turn the broiler on to give the meatballs a slightly crispy, golden-brown finish. However, keep a close eye on them to prevent burning.
Serve meatballs by themselves with tzatziki on the side or with lemon orzo. Garnish with a few tablespoons of crumbled feta, pickled red onions, and chopped mint/parsley.