In a large mixing bowl, combine the ground chicken, chopped fresh spinach, shredded white cheddar cheese, breadcrumbs, finely chopped onion, minced garlic, Dijon mustard, Worcestershire sauce, salt, and black pepper. Gently mix until just combined.

Divide the mixture into four equal portions and shape each into a round patty, about ¾ inch thick, making a slight indentation in the center.

Preheat a large skillet over medium heat and add a drizzle of olive oil, ensuring the pan is evenly coated.

Add the shaped patties to the skillet and cook for about 5 to 6 minutes on each side until they develop a golden-brown crust, checking for an internal temperature of 165°F (75°C).

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

Assemble the burgers with your choice of buns and toppings, enjoying your flavorful chicken burgers!