Spinach and Feta Chicken Burger Take a look at our recipe for the Spinach and Feta Chicken Burger. Serves 4 (1 burger per serving) Ingredients: 1 lb. ground chicken 4 cups spinach 1 tsp. olive oil 1 egg ½ cup breadcrumbs 1 garlic clove, minced 1 cup onion, diced 2