Preheat your oven to 425, and line a baking sheet with a silpat or parchment paper.
Spread chopped cauliflower out on the tray and bake for 20 minutes.
While the cauliflower is roasting, cover your flatbread or pizza crust with bbq sauce.
Once the veggies are done roasting, drizzle with some bbq sauce and toss to coat.
Top your pizza with the cauliflower, then add the cheese and red onion.
Bake for 12-15 minutes or until cheese is melty and crust is looking crispy. Top with chopped cilantro if desired and serve. Enjoy!