In A Large Skillet, Saute The Onion, Mushrooms And Peppers In Oil Until Tender. Layer Six Slices Of Bread With Ham, Turkey, Pastrami, Bacon, Vegetables And Cheese; Top With Remaining Bread. Wrap Each Sandwich In Foil. Grill, Uncovered, Over Medium Heat For 4-5 Minutes On Each Side Or Until Heated Through.