01 - In a large bowl, combine ground turkey or chicken, egg, oats, red onion, Dijon mustard, garlic, parsley, smoked paprika, salt, and black pepper. Mix gently until just combined—do not overwork the meat.
02 - Divide mixture into 4 equal portions and shape each into a patty about 1/2 inch thick. Press a slight indentation in the center of each patty to prevent puffing during cooking.
03 - Preheat a nonstick skillet or grill over medium-high heat. Lightly oil the surface if needed to prevent sticking.
04 - Cook patties for 4-5 minutes per side, or until golden brown and fully cooked through. Internal temperature should reach 165°F when measured with a meat thermometer.
05 - Lightly toast whole wheat buns on the grill or in a toaster for 1-2 minutes until golden and crisp.
06 - Place a lettuce leaf on the bottom bun, top with a cooked patty, spread Greek yogurt over the meat, then add tomato slices, red onion, and avocado. Finish with the top bun and serve immediately.