Keto Cauliflower Au Gratin is a cheesy, flavorful side dish that is great for every occasion. You only need 8 ingredients, and it’s one of the best things you will ever taste. Cauliflower seasoned with salt, pepper, garlic, and parsley, then topped with shredded swiss cheese. It is inspired by the classic French Potato Gratin Savoyard and just as delicious.