01 - In a mixing bowl, combine ground turkey, finely chopped onion, minced garlic, chopped parsley, smoked paprika, ground cumin, salt, and black pepper. Mix gently until just combined.
02 - Shape the mixture into 4 evenly sized patties.
03 - Heat olive oil in a large skillet or grill pan over medium heat. Cook patties for 5 to 6 minutes on each side until golden brown and internal temperature reaches 165°F (74°C). Remove and let rest.
04 - In a bowl, mash avocados until mostly smooth. Stir in diced tomato, red onion, minced jalapeño if using, chopped cilantro, lime juice, salt, and black pepper. Adjust seasoning as needed.
05 - Lightly toast burger buns if desired.
06 - Layer lettuce leaves on bottom buns, add turkey patties, a generous spoonful of guacamole, sliced tomato, and sliced red onion. Top with remaining bun halves.
07 - Serve immediately for best flavor and texture.