01 - In a large bowl, combine the lean ground turkey, finely chopped onion, minced garlic, chopped fresh parsley, smoked paprika, salt, and black pepper. Mix gently until just combined; avoid overmixing to maintain a tender texture.
02 - Divide the turkey mixture into 4 equal portions. Shape each portion into a burger patty, approximately 1 inch thick.
03 - Heat 1 tablespoon of olive oil in a large skillet or grill pan over medium heat. Place the patties in the hot pan and cook for 5 to 6 minutes per side, or until they are fully cooked through and reach an internal temperature of 165°F.
04 - While the turkey patties are cooking, lightly toast the whole wheat burger buns if desired, using a toaster or by placing them cut-side down in a dry skillet for a minute or two.
05 - To assemble, place one lettuce leaf on the bottom half of each toasted bun. Top with a cooked turkey patty, a slice of tomato, red onion rings, and a generous portion of avocado slices. Add ketchup or mustard to your preference, then cover with the top bun.
06 - Serve the turkey burgers immediately with your favorite accompanying side dish.