Place the tomatoes, sliced carrot, bell pepper and red onion on a sheet tray in four separate rows. Drizzle the oil over the vegetables and season with salt. Roast the vegetables in the oven for 10-15 minutes, or until softened and just beginning to brown. Set aside to cool.
Spread the tomato sauce over the cauliflower pizza crust and top with the shredded mozzarella. Evenly spread the onions over the pizza followed by the carrot, peppers, and then tomatoes. Season with dried oregano and crushed red pepper and put the pizza back in the oven and bake 6-8 minutes or until the cheese is melted.
Remove from oven and garnish with parsley. Cut and serve immediately.