While the grill heats, prepare the vegetables. Cut the peppers into halves or quarters and slice the onions into thick slices so they stay together on the grill.
Lightly brush the vegetables with olive oil.
Season the room temperature steaks evenly with the spice rub
Once the grill is hot, lightly oil the grates. Place the steaks on the grill and cook for 2 to 3 minutes over medium-high heat. Reduce the heat to medium, flip, and continue cooking until the steak reaches your preferred doneness.
Add the peppers and onions to the grill while the steak cooks. Grill the vegetables for 4 to 5 minutes per side until tender and lightly charred.
Remove the steaks from the grill and let them rest for 5 minutes before slicing.
Remove the vegetables from the grill and cut them into slices
Slice the steak
Fill the rolls with steak, peppers, onions, and cheese. Serve warm.
Notes
store lefotver room temperature beef, and peppers in the refrigerator in an airtight container for up to 3 days and the rolls separately at room temperature.Serve as an appetizer in mini slider buns or as a main course with a side salad or veggies.