We loved this recipe. We grilled them outdoors on the gas grill - 5 minutes to heat the grill on high, and then 5 minutes each side, and they were perfect. I also used pre-sliced provolone instead of grating it.
This is a great way to eat a turkey burger. My husband - who normally won't eat a turkey burger - really enjoys this. You can substitute mozzarella for the provolone.