Cheesey Vegetable Puff Pie

Name: Cheesey Vegetable Puff Pie
Cook time: 55 min
Total time: 55 min
Cuisine: European
Ingredients: 1 portion cheese sauce or vegan cheese sauce; 1 tbsp olive oil; 300g potatoes,, cut into chunks; 200g carrots, sliced fairly thickly; 250g chestnut mushrooms, sliced; 150g frozen peas; a small tin sweetcorn; 500g block puff pastry (Jus Rol is suitable for vegans); a little milk or unsweetend soya milk; a good grinding salt and pepper