Heat grill to HIGH heat.
In a large bowl, combine ground turkey and grated Gruyere cheese using a fork.
Add scallions, breadcrumbs, Dijon mustard, and minced garlic to the turkey mixture.
Season generously with salt and pepper.
Gently form the mixture into 4 patties, approximately 1 inch thick.
Lightly oil the grill grates with olive oil.
Place patties on the hottest part of the grill and sear for 1-2 minutes on each side until browned.
Move patties to a cooler section of the grill and continue cooking for 5-10 minutes per side until cooked through.
Grill buns lightly if desired.
Serve on buns with lettuce, tomato, and pickles.