Preheat your oven to 425°F.
Prepare the cauliflower crust by combining cauliflower rice, egg white, Parmesan cheese, and a pinch of salt and pepper in a bowl. Mix until well incorporated.
Press the cauliflower mixture onto a parchment-lined baking sheet forming a thin, even round pizza base.
Bake the crust for 15-20 minutes until it starts to turn golden and firm.
While the crust bakes, season the chicken breast with salt, pepper, and your favorite herbs. Cook the chicken in a non-stick pan or bake until fully cooked, then shred or slice into pieces.
Chop the red bell pepper, zucchini, and cherry tomatoes. Toss the vegetables with a drizzle of olive oil, salt, and pepper. Roast the vegetables in the oven for about 10 minutes or until just tender.
Remove the crust from the oven. Evenly layer the cooked chicken and roasted vegetables over the crust.
Optional: Sprinkle extra herbs on top for added flavor and return to the oven for an additional 5 minutes if a warmer topping is desired.
Serve immediately and enjoy your nutritious, protein-packed pizza.