Oats
Old-fashioned oats or quick-cooking oats will work here (steel-cut oats will not). Old-fashioned oats lend a more chewy, “rustic” texture. Quick-cooking oats disappear more into the bars. If desired, you can briefly blitz old-fashioned oats in the food processor to achieve the texture of quick-cooking oats.
Make the vegetable foil pack: Fold a large piece of foil in half so you have a double layer. Add the sliced peppers and onions. Season the vegetables with 1 tablespoon of olive oil and sprinkle with 1 teaspoon fajita seasoning.
Fold the sides of the foil up and crimp it tightly on top to make a packet.
Season the steak: Season the steak liberally with the seasoning mix (about 3/4 teaspoon per side).
Preheat your grill to 450°F for high heat grilling.
Grill the packet and the steak: Once the grill is hot, transfer the veggie packet and the steak to the grill. Grill over steak over high, direct heat. After 4 minutes, flip the steak and grill for 5 to 7 additional minutes.
This will finish cooking the steak to about a medium to medium-rare temperature and soften the veggies. Remove both the foil packet and the steak from the grill and let cool for a few minutes.
