In a large mixing bowl, combine ground chicken, chopped fresh spinach, shredded sharp white cheddar cheese, breadcrumbs, minced garlic, onion powder, salt, and black pepper. Mix thoroughly.

Divide the mixture into 4 equal parts, shaping each part into a patty about ½-inch thick.

In a large skillet, heat olive oil over medium heat for 2-3 minutes until shimmering.

Add the chicken patties to the skillet and cook for 5-7 minutes on each side until golden brown, checking for an internal temperature of 165°F.

Toast the burger buns to your preference, either in an oven or on a griddle until lightly golden.

Assemble the burgers by placing a patty on each bun and add your choice of toppings.

Serve the burgers with a dollop of mayonnaise or your favorite condiment.