Take a large mixing bowl and blend the ground turkey, parsley, garlic, parmesan cheese, dried basil, breadcrumbs, egg, salt, and pepper until they are well combined.
Using your hands, shape the mixture into 15 burger patties. Make each patty roughly into a rectangular shape, as you'll be using three patties per sandwich.
Preheat a griddle or skillet over medium-high heat. Place the patties onto the hot surface and cook for 4-5 minutes on each side or until fully cooked, sizzling, and golden brown.
While the burgers are cooking, toast the hoagie buns in the oven for a few minutes until lightly browned.
After the burgers are thoroughly cooked, grab your hoagie buns and assemble three patties on each. Elevate the flavor by topping the patties with a slice of mouthwatering cheese.
Place the hoagie burgers in the oven for a few minutes to melt the cheese.
Once the cheese is melted, remove the hoagie burgers from the oven and add your favorite toppings. Some great options include sliced tomatoes, lettuce, onions, pickles, and ketchup.