In a medium mixing bowl, combine the ground turkey, sea salt, black pepper, garlic powder, dried oregano, and finely chopped fresh parsley.
Gently mix the ingredients by hand until just incorporated, taking care not to over-handle the meat to maintain a tender, juicy texture.
Divide the mixture into two equal portions and shape them into patties, pressing a small dimple into the center of each to prevent bulging during cooking.
Heat the extra virgin olive oil in a non-stick skillet over medium-high heat until it begins to shimmer.
Add the turkey patties to the skillet and sear for 5 to 6 minutes per side, or until the exterior is beautifully browned and the internal temperature reaches 165°F.
While the burgers cook, wash and dry the butter lettuce leaves and thinly slice the avocado.
Assemble the burgers by placing each patty inside a butter lettuce leaf, topping with avocado slices, and serving immediately alongside a fresh bed of baby spinach.