Mix Ground Beef With Seasoning Mix In Large Bowl Until Well Blended. Shape Beef Into 6 Oblong Patties, About 6 X 3-Inches Each. Whisk Together Barbecue Sauce And Dressing In Small Bowl; Set Aside. Spray Grate Of Outdoor Grill And Utensils With Grilling Spray. Preheat Grill To Medium Heat. Grill Patties 5 Minutes On One Side Or Until Juices Begin To Appear On Surface. Turn Patties Over; Top Each With 3 Slices Bacon. Cook About 4 Minutes Longer; Top Each Patty With 2 Triangle Pieces Of Cheese, Overlapping To Cover Patty. Remove Patties When Cheese Begins To Melt. Spread Barbecue-Dressing Mixture On Bottom Of Each Roll. Add A Lettuce Leaf. Place Cooked Patty With Bacon And Cheese On Lettuce. Spoon Additional Barbecue-Dressing Mixture Over Cheese. Sprinkle With Fried Onions, If Desired. Serve Immediately.