Prepare the Ingredients: Chop the fresh cilantro, dice the yellow onion, and crumble the feta cheese.
Mix the Patty Ingredients: In a bowl, combine ground chicken, chopped spinach, feta cheese, onion, cilantro, and seasonings. If adding mozzarella, mix it in for extra cheesiness. Form into patties.
Cook the Patties: Heat a nonstick or cast iron pan with a little butter (or oil) over medium heat. Cook the patties 4-5 minutes per side until golden brown and fully cooked through.
Serve & Enjoy: Pair with your favorite side, or let cool for meal prep storage.