Adjust the heat to medium, and if you are using leftover steak, add it and the roasted bell peppers to the griddle. If you are cooking fresh steak, cook it to your desired temperature and then combine it with the bell peppers. Once the steak is fully warmed, form the steak mixture into two loafed shapes and top with the provolone cheese. Close the grill lid and turn the heat off. Allow the cheese to melt for a few minutes.