Trust me...this baby is hearty and satisfying all on it's own! However, if you insist on serving it up with something, you can never go wrong with a nice soup or side salad. A light tomato salad, cucumber salad or kale caesar salad are my favourites. Cauliflower rice of any kind is always a great Keto side dish option to any meal. And heck. If you're not following the Keto diet, then go ahead and rub it in all of our faces and serve this Philly Cheesesteak Casserole up with some homemade crunchy garlic bread. I won't be mad.