Prepare pearl couscous according to package directions. Replace water with chicken broth.

In large bowl, combine lamb, eggs, 3/4 cup feta, panko breadcrumbs, Greek seasoning and salt. Knead gently to combine. Form small meatballs using hands.

In large pan over medium heat, heat 1 tablespoon oil. Cook meatballs 5 minutes until browned on all sides. Reduce heat to medium-low and cover pan with lid. Cook 5 minutes, or until fully cooked.

In medium saucepan over medium-high heat, heat remaining oil. Add onions and cook 2 minutes. Add mushrooms and zucchini and cook 3 minutes. Stir in pearl couscous until ingredients are fully combined.

Divide pearl couscous between bowls. Add meatballs then tzatziki. Garnish with remaining feta and mint, if desired.