In a large bowl, add the ground chicken, chopped spinach, shredded cheddar, breadcrumbs, chopped onion, minced garlic, Dijon mustard, Worcestershire sauce, and a pinch of salt and pepper.

Gently mix with your hands or a spoon until everything is evenly combined; avoid overworking the meat.

Divide the mixture into four equal portions and shape each into a patty about 3/4-inch thick. Press a slight dimple in the center of each patty to help them cook evenly.

Heat a skillet over medium heat and add a little olive oil to coat the pan.

Cook the patties 5–6 minutes per side, until they’re golden brown and reach an internal temperature of 165°F (75°C).

Transfer cooked patties to a plate and let them rest for 3–5 minutes to redistribute juices.

Assemble burgers on buns with your chosen toppings and serve immediately.