Gastropub Brie And Spinach Gratin

Potatoes (25%) ,Butternut Squash (22%) ,Whole Milk, Spinach (11%) ,Somerset Brie Cheese (Milk) (6%), Extra Mature Cheddar Cheese (Milk) (5%) , Double Cream (Milk) ,Wheatflour, Extra Virgin Olive Oil, Pumpkin Seeds, Cornflour, Sage Olive Oil , Salt, Lemon Juice, Parsley ,Coarse Ground Black Pepper, Yeast