Easy Vegetarian Quorn Moussaka

Ingredients

• 1 tablespoon olive oil
• 2 medium aubergines, sliced ½ cm thick
• 1 red onion, chopped finely
• 200 g mushrooms, chopped
• 300 g Quorn mince
• 1 vegetable stock cube
• Salt and pepper to taste
• 400 g tin chopped tomatoes
• About ½ tin of water (approximately 200 ml)
• 250 g Greek yogurt
• 100 g cheddar cheese, grated