I took my grandma’s classic recipe for Tuna Casserole and made it “skinny”! This recipe for Skinny Tuna Casserole is a simple, inexpensive, and healthy twist on the staple casserole. It seriously only takes a few short minutes to put together and it is perfect for the entire family. Even the clean up is super easy! Feel free to add in extra vegetables like peas or carrots to the casserole as well.