In a large mixing bowl, combine the ground chicken, finely chopped spinach, garlic powder, onion powder, dried thyme (or your herb of choice), paprika, kosher salt, and freshly ground black pepper. Mix until all ingredients are evenly distributed.
Divide the chicken mixture into five equal portions and shape them into patties. Make sure they are slightly larger than your buns, as they will shrink a little during cooking.
Preheat your grill or griddle over medium heat. Lightly spray it with olive oil to prevent sticking.
Place the chicken patties on the grill or griddle and cook for about 5-6 minutes on each side. To ensure they are fully cooked, use a food thermometer to check that the internal temperature reaches 165°F (75°C).
While the patties are cooking, toast your low-calorie hamburger buns on a separate skillet or in a toaster until they are golden brown.
Once the patties are cooked and the buns are toasted, assemble your chicken burgers. Start with the bottom bun, add the patty, and pile on your favorite toppings.