01 - In a large bowl, combine ground turkey, chopped red onion, minced garlic, parsley, Dijon mustard, smoked paprika, salt, and pepper. Mix gently until just combined, being careful not to overwork the meat.
02 - Divide the mixture into 4 equal portions and shape each into a patty approximately 3/4-inch thick.
03 - Heat olive oil in a large skillet or grill pan over medium heat. Add patties and cook for 5-6 minutes per side, or until golden brown and cooked through. Internal temperature should reach 165°F.
04 - While patties cook, place burger buns split-side down on the grill or in a toaster to achieve a light golden color.
05 - Spread mayonnaise on the bottom buns if desired. Layer with lettuce, turkey patty, tomato slice, red onion, and avocado slices. Top with the other half of the bun.
06 - Serve immediately while warm for optimal flavor and texture.