Veggie loaf

Name: Veggie loaf
Ingredients: 1 tbsp vegetable oil, plus extra for the tin; 1 red onion, roughly chopped; 250g chestnut mushrooms, roughly chopped; 250g puy lentils; 4 eggs; 1 tsp garlic granules; 50g vegetarian Italian-style hard cheese, grated; 250g pouch microwaveable brown rice; 75g walnuts, chopped; small handful of parsley, finely chopped; 250g cottage cheese; cranberry sauce, to serve (optional)