Speedy Barbecue Chicken Sandwich

1. Heat the olive oil in a skillet over medium heat. Add the onion and bell pepper and cook until crisp-tender, about 5 minutes. 
2. Add the chicken and barbecue sauce and simmer until heated through, about 3 minutes. 
3. Divide the chicken mixture among the rolls and top with some of the coleslaw (you may not use all the slaw).

For the slaw:

1. Combine the cabbage, carrot and bell pepper in a bowl. 
2. Whisk together the mayonnaise and lemon juice; season to taste with salt and pepper. 
3. Drizzle the dressing over the vegetables and toss to combine. Let sit while you prepare the sandwiches.