01 -
Grab a large mixing bowl and combine the ground chicken with chopped spinach, crumbled feta, salt, pepper, garlic powder, onion powder, and mayonnaise. Gently mix everything together - don't overwork the meat or your burgers will turn out tough and dense.
02 -
Divide the mixture into 5 equal portions, about 3.5 ounces each. You can use a kitchen scale for precision or line a 1/2 cup measuring cup with plastic wrap for even portions. Form each portion into a patty and press a small indent in the center with your thumb - this prevents the burgers from puffing up while cooking.
03 -
Heat a lightly oiled skillet or griddle over medium-high heat. Place the patties in the pan and cover with a lid or large bowl to create a dome effect. Cook for 4-5 minutes on the first side, then flip and cook uncovered for another 3-4 minutes until the internal temperature reaches 155-160°F. Let the burgers rest for 5 minutes before serving to lock in the juices.