In a large mixing bowl, combine the ground chicken, chopped spinach, shredded white cheddar cheese, breadcrumbs, finely chopped onion, and minced garlic. Add a pinch of salt and pepper for flavor. Use your hands or a spoon to gently mix the ingredients until just combined—avoid overmixing to ensure tender burgers.

Divide the mixture into four equal portions and shape each portion into a patty roughly ¾ inch thick. Make a slight indentation in the center of each patty to help them cook evenly.

Place a large skillet over medium heat and add a tablespoon of olive oil. Allow the oil to heat up until shimmering, which should take about 1-2 minutes.

Carefully place the patties in the skillet, ensuring not to overcrowd them. Cook for about 5-6 minutes per side until golden brown and cooked through.

If desired, lightly toast your burger buns in the skillet for 1-2 minutes or until golden brown.

Place each cooked patty on a toasted bun, then dress with your favorite toppings such as lettuce or tomato. Serve and enjoy!