01 - In a large bowl, combine ground turkey, chopped onion, minced garlic, parsley, Worcestershire sauce, smoked paprika, salt, and black pepper. Mix gently until just combined to avoid toughness.
02 - Shape the mixture into four even patties, slightly larger than buns as they will shrink while cooking.
03 - Heat a grill or skillet over medium-high heat and lightly oil the surface.
04 - Place patties on the hot surface and cook 5 to 6 minutes per side until internal temperature reaches 165°F and the exterior turns golden brown.
05 - During the last minute of cooking, add a cheddar slice on each patty and cover to melt the cheese evenly.
06 - Toast whole-wheat buns on the grill or in a toaster until lightly golden.
07 - Spread mayonnaise or burger sauce on the bottom bun, layer with lettuce, turkey patty topped with melted cheese, tomato slices, red onion, and optional sauces. Top with the upper bun.
08 - Serve immediately alongside preferred side dishes.