Blackstone Chicken Phillies are the best chicken philly sandwich recipe ever, super fun and easy to make on the Blackstone flat top grill!
Turn the Blackstone on medium and preheat several minutes. Add some cooking oil of choice and put the chicken on one side and the onions and mushrooms on the other side of the griddle.
Season the chicken and the onions/ mushrooms with kosher salt, pepper, and Old Bay seasoning. Cook for 6 to 8 minutes, flipping and turning a few times throughout and add the worcestershire sauce to both the chicken and the onions/ mushrooms.
Combine the chicken, onions, and mushrooms on the flat top grill. Add the banana peppers and garlic. Cook 6 to 8 more minutes, flipping and turning a few times.
Place the buns on the grill, cut side down, for a minute or two to toast them.
Divide the chicken and veggies into 6 piles on the grill and place 2 slices of provolone over top of each and turn griddle off.
Once the cheese has melted, place on a bun with mayo.