Preheat oven to 200 degrees Celsius/ Gas mark 6. Cook the cauliflower rice in pot of boiling salted water for about 2 minutes or until tender; drain well in a fine sieve. Let cool completely.
Transfer the cauliflower rice to clean tea towel and squeeze dry, then transfer to a bowl. Combine the ground flaxseed with 3 tbsp water, then stir together the cauliflower, gluten-free flour, flaxseed mixture, nutritional yeast, Italian herb seasoning, garlic powder, salt and pepper.
Line a 12-inch pizza tray with parchment paper; drizzle with 1 tbsp olive oil. Add the cauliflower mixture to the center of the pizza tray, spreading 1/4-inch thick to form 10-inch round, making the edges slightly thicker to form a crust. Bake for 25 to 30 minutes or until the edges start to turn golden and the crust is firm.
Meanwhile, heat the remaining oil in a pan over a medium heat; cook the Quorn Pieces for 5 to 8 minutes or until heated through. Let cool slightly.
Using 2 forks, shred the Quorn Pieces a little then toss with the barbecue sauce; set aside.
Sprinkle mozzarella over the cooked cauliflower crust. Top with the shredded Quorn Pieces, red onion and sweet corn. Bake for 8 to 10 minutes or until golden brown and the cheese has melted.
Garnish with green onions and cut into slices before serving.
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