These oat and banana cookies are really healthy and, unbelievable as it sounds, they're gluten-free, sugar-free, dairy-free, egg-free and fat-free - yet absolutely delicious! In this version I've added some desiccated coconut and pumpkin seeds but you can add other seeds and nuts, dried fruits (such as raisins, cranberries), grated fresh fruits (such as apple or pear), berries, chocolate bits, cocoa powder, mixed spices, lemon zest or whatever else you fancy!