In a large mixing bowl, combine the ground chicken, chopped spinach, shredded white cheddar cheese, breadcrumbs, finely chopped onion, minced garlic, Dijon mustard, Worcestershire sauce, salt, and black pepper. Use your hands to gently mix all the ingredients until just combined.

Once the mixture is well combined, divide it into four equal portions. With slightly damp hands, shape each portion into a patty, making them about one inch thick.

Heat a large skillet over medium heat, adding a drizzle of olive oil to coat the bottom.

Cook the patties for about 5-6 minutes on one side, then gently flip each patty and cook for an additional 5-6 minutes on the other side.

Once cooked through, transfer the patties to a plate and let them rest for a few minutes.

Place each juicy patty on a burger bun and layer with your favorite toppings. Serve immediately.