In a large mixing bowl, combine the ground chicken, chopped spinach, white cheddar cheese, breadcrumbs, Parmesan cheese, minced garlic, onion powder, salt, black pepper, and paprika. Mix until all ingredients are well incorporated.
Divide the mixture into four equal portions and shape each portion into a patty, about 1/2 inch thick.
Heat olive oil in a large skillet over medium heat. Once hot, add the chicken patties to the skillet. Cook for 5-6 minutes on each side or until the internal temperature reaches 165°F and the patties are golden brown.
While the patties are cooking, toast the whole wheat burger buns in a toaster or on a separate skillet until lightly browned.
Assemble the burgers by placing a chicken patty on each bun and topping with lettuce, tomato, and any other desired toppings. Serve immediately.