Mix the Ingredients: In a large bowl, combine ground chicken, sun-dried tomatoes, spinach, red onion, garlic, dill, oregano, salt, and pepper. Add feta cheese (if using) and mix gently until well combined. Avoid overmixing to keep the patties tender.
Form the Patties: Divide the mixture into 4 equal portions and shape each portion into a patty. Ensure the patties are evenly sized for consistent cooking.
Cook the Patties: Heat olive oil in a large skillet over medium heat. Cook the patties for about 5 minutes on each side, or until golden brown and cooked through (internal temperature should reach 165°F/74°C). Alternatively, grill the patties for a smoky flavor.
Serve: Serve your burgers in a traditional bun, a gluten-free lettuce wrap, or on a protein bowl with fresh veggies and tzatziki sauce.