Take one of your cheese wedges and spread the whole thing inside one pita pocket half. Continue with how ever many sandwiches you want to make.
Then line the inside of your pita pocket with roast beef on the bottom and add in your desired amount of peppers and onions on top.
When your pitas are all stuffed place them, about 2 at a time, in your skillet that you cooked the peppers and onions in. It should have a nice coat of olive oil in there from before. Warm the sandwiches on both sides at about medium to medium low until it is slightly crispy. Just watch them so they don't burn. Continue until all your sandwiches are done.
Remove from the heat and serve immediately!
Recipe by A Fireman's Wife at https://afiremanswife.com/2018/07/19/easy-roast-beef-pita-sandwiches/