In a large bowl combine ground turkey, grated onion, egg, Worcestershire, breadcrumbs, salt, pepper, and garlic powder. Mix gently until just combined; don’t overwork the meat.
Divide into four even portions and shape into patties about 3/4-inch thick, making a small dimple in the center of each to prevent puffing.
Heat a large skillet or grill over medium-high heat and add olive oil or spray. Cook patties 4–5 minutes per side, flipping once, until internal temperature reaches 165°F.
Rest burgers 3 minutes before serving on toasted buns with your favorite toppings.