Break up the cauliflower into golf ball sized pieces. You probably need to slice a few of the larger pieces, try doing it right along the stems so you have a solid piece to skewer.
Toss the cauliflower into a bowl and drizzle with olive oil and a few healthy pinches of salt. Toss to combine.
Skewer the cauliflower for easier grilling.
Grill about 3 minutes per side to char. Brush with the Bar-B-Q sauce on all sides and continue to grill for a few more minutes per side so the sauce sticks to the cauliflower. Remove from grill.
Build the dish by adding some cauliflower, some cheese, bacon, peppers, and more cheese. Repeat until you use all the ingredients or fill your baking dish.
Bake at 400 for about 10 minutes until the cheese is melty and starting to brown.
Top with the scallions and more Bar-B-Q sauce and serve.