In a large mixing bowl, add ground turkey. Then using a box grated shred the yellow onion on top of the turkey.
Add in dijon mustard, garlic cloves, fresh parsley, onion powder, salt, and pepper.
Gently mix with hands and form 4 to 5 equal-sized patties
Clean the grill and heat to medium-high, between 375°F to 400°F. Make sure to grease your grill by using spray or dipping paper towels in oil and spreading across the grill. Read notes below if using a grill pan inside on stovetop.
Place turkey burgers on the heated grill, cover with the lid and cook for 5 minutes until grill marks appear. Carefully flip the burgers on the grill for another 5 minutes, until the internal temperature reaches 165°F.
Assemble your burgers on a regular or lettuce bun with red onion, avocado, tomato, lettuce, or toppings of your choice. If you are keto, use a lettuce bun or keto bun.
I do not recommend using 99% lean ground turkey for this burger recipe.Yellow Onion: You can substitute with a white onion.Grill Pan (Indoors): Feel free to use a grill pan on the stovetop if needed. Heat it to medium-high, grease the pan, and follow the same cooking instructions.Storing: For best results, store leftovers in an airtight container in the fridge for up to 4 days.Reheating: Reheat grilled turkey burgers in the air fryer for 3 – 5 minutes at 350°F or in the microwave for 45 – 90 seconds or until warm. You can also try the stovetop for 2 minutes on each side.Freezing: Let grilled burgers cool to room temperature then store them in a freezer-safe bag in the freezer for up to 3 months.