Preheat your oven to 425°F (220°C).
Prepare the cauliflower crust by placing 150g of cauliflower in a food processor until it reaches a rice-like consistency. Lightly steam it if desired to soften.
Combine the processed cauliflower with one beaten egg and 30g of low-fat mozzarella cheese. Season with a pinch of salt and pepper. Mix well.
Press the cauliflower mixture onto a parchment-lined baking sheet forming a thin, even circle to create your pizza base.
Bake the crust in the preheated oven for about 12-15 minutes until it starts to turn golden and set.
While the crust bakes, season 100g chicken breast with salt and pepper, then grill or pan-sear until cooked through. Once cooled, shred or dice the chicken.
Toss sliced red bell pepper, red onion, and zucchini with 1 tsp olive oil, and season with salt and pepper. Spread these vegetables on a baking sheet and roast in the oven for about 10 minutes until tender.
Remove the crust from the oven and spread 2 tbsp of BBQ sauce evenly over it.
Distribute the cooked chicken evenly over the sauce, then layer the roasted vegetables on top.
Return the pizza to the oven for an additional 5-7 minutes to heat through and allow flavors to meld.
Slice and serve immediately, enjoying a delicious, high-protein pizza featuring roasted veggies and a delightful BBQ kick.