In a large mixing bowl, combine the ground chicken, finely chopped spinach, shredded white cheddar, garlic powder, onion powder, salt, and pepper.
Gently mix the ingredients by hand until evenly distributed, taking care not to over-compress the ground chicken.
Divide the mixture into 4 equal portions and shape into patties approximately 1/2-inch thick.
Heat olive oil in a non-stick skillet or griddle over medium-high heat.
Sear the patties for 6 to 7 minutes per side, or until the internal temperature reaches a food-safe 165°F (74°C) as measured by a digital thermometer.
Optional: Toast the buns in the residual heat of the pan before assembling the burgers with preferred condiments.