01 - In a mixing bowl, combine ground turkey, chopped onion, minced garlic, parsley, Dijon mustard, salt, and black pepper. Mix gently until just combined without overworking.
02 - Divide the mixture into four equal portions and shape each into patties slightly larger than the buns.
03 - Heat olive oil in a large skillet or grill pan over medium heat. Place the patties in the pan and cook for 5 to 6 minutes per side, until golden brown and internal temperature reaches 165°F.
04 - During the last two minutes of cooking, top each patty with sliced Brie. Cover the pan or loosely tent with foil to allow the cheese to melt.
05 - Toast the burger buns until golden brown.
06 - Place arugula or spinach on the bottom half of each bun, top with the turkey patty and melted Brie, spoon cranberry sauce on top, and finish with the top bun.
07 - Serve immediately while warm and enjoy.