01 - Combine cranberries, orange juice, sugar, orange zest, and salt in a small saucepan. Bring to a simmer over medium heat and cook for 8 to 10 minutes, stirring occasionally, until the cranberries burst and the sauce thickens. Set aside to cool.
02 - In a large bowl, combine ground turkey, chopped onion, minced garlic, parsley, egg, breadcrumbs, Dijon mustard, salt, and black pepper. Mix gently until just combined to avoid tough patties.
03 - Divide the mixture into 4 equal portions and shape each into a burger patty.
04 - Heat olive oil in a skillet over medium heat. Cook patties for 5 to 6 minutes per side, or until golden brown and fully cooked internally to 165°F.
05 - Lightly toast burger buns if desired.
06 - Place a lettuce leaf on the bottom half of each bun. Top with a cooked turkey patty, spoon cranberry sauce over it, add slices of red onion, and finish with the top bun.
07 - Serve immediately to enjoy the flavors at their best.