Start by seasoning the steaks and letting them sit and rest for 1-2 hours in the fridge to soak in the flavor if you prefer.
Once ready to cook, preheat the Ninja Foodi Grill by selecting the GRILL function, HIGH, for 5-7 minutes depending on your desired doneness.
Coat the grill with cooking spray, place the filet mignon on the grill.
Close and grill for 3 minutes, then open and flip and continue cooking until your desired temperature. (145*F for medium-rare to 160*F for medium-well)