BBQ sauce, mayo, mustard, tomato, lettuce, etc. (optional)
In a large skillet, heat oil over medium high heat. Add onion and sauté until translucent, 4 to 5 minutes. Add garlic and cook until fragrant, 1 minute. Transfer to a medium bowl and add turkey, breadcrumbs, mustard and parsley. Gently mix until combined and form into 4 thin patties.
Heat a grill or grill pan to medium-high. Clean and lightly oil hot grill. Season patties with salt and pepper, then brush with oil. Grill, covered, until cooked through, about 4 minutes per side. Top each burger with Swiss or cheddar cheese. Serve burgers on buns with desired toppings.
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