Preheat the oven to 450 degrees F. Line a large rimmed baking sheet with parchment paper and set aside.
In a large bowl, combine the breadcrumbs, mint, parsley, onion, whole egg and extra egg white, cumin, salt, cinnamon, and cayenne. Use a fork to mix these together well.
3/4 cup Panko breadcrumbs, 1/4 cup minced fresh mint, 1/4 cup minced fresh parsley, 1/2 small yellow onion, 1 large whole egg plus 1 egg white, 2 teaspoons cumin, 1 teaspoon kosher salt, 3/4 teaspoon cinnamon, pinch cayenne pepper
Add the ground lamb and ground beef. Continue using the fork to very gently pull the breadcrumb mixture through the meat, until it is pretty even. Try not to overwork.
1 pound ground lamb, 1/2 pound lean ground beef
Scoop the mixture into meatballs of about 1 and 1/2 Tablespoons each and arrange on the prepared baking sheet. You can roll them gently between your hands to smooth them out, or skip this step if you don’t mind a “rustic” shape.
Bake the meatballs for 9-11 minutes, until golden brown and cooked through to an interior temperature of 160°F.
When meatballs are cooked through, serve with greens, a salad, olives, couscous, pita, etc., as desired. Enjoy!