Heat a grill pan or large skillet. Drizzle chicken with oil, to cover,and season with grill seasoning blend or salt and pepper. Grill or pan-fry 6 minutes on each side.
Heat broiler, lightly toast rolls on cookie sheet and remove.
Heat a large skillet over medium high heat. Add 2 tablespoons oil, garlic, crushed red pepper flakes, mushrooms, peppers, onions and oregano. Saute veggies and season with salt and pepper. Cook 5 minutes, then deglaze the pan with wine or stock. Pick up tasty bits off the bottom of the pan with a wooden spoon or heat safe spatula. Add tomatoes and parsley to the sauce. Slice chicken breasts on an angle and set into sauce. Pile chicken and veggies into sub rolls and cover with sliced provolone. Melt cheese under hot broiler. Serve.