Preheat the oven to 200°C/Fan 180°C/Gas 6.
Spray a large, deep frying pan with low calorie cooking spray. Add the onions, celery and carrots and stir-fry for 4-5 minutes. Stir in the Quorn, tomatoes, Worcestershire sauce (if using) and stock. Bring to the boil, cover and simmer for 20 minutes. Season to taste and stir in the baked beans.
Meanwhile, cook the potatoes in a pan of lightly salted boiling water for 15 minutes until tender. Drain well and roughly crush with the back of a fork.
Tip the Quorn mince mixture into a large ovenproof dish, spoon over the potatoes to cover and bake for 20-25 minutes until golden.
Serve hot with vegetables of your choice.
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