Heat Barbecue To Medium-High Heat. Mix First 4 Ingredients; Shape Into 8 Thin Patties. Combine Shredded Cheese And 2 Tbsp. Bacon; Spoon Onto Centres Of 4 Patties. Cover With Remaining Patties; Pinch Edges Together To Seal. Grill 7 To 9 Min. On Each Side Or Until Done (160 Degrees F). Spread Bottom Halves Of Buns With Dressing. Fill Buns With Burgers, Singles, Remaining Bacon And Onions.