I admit I had no idea what to expect from this recipe, but I was definitely pleased with the outcome! It was better after a little bit of time out of the oven--after just five minutes it was still pretty gooey and after about ten it was definitely more casserole-like. I used a combination of cheddar, colby, and mozzarella cheeses as that is what I had on hand, and plain yogurt for the sour cream. I think the olive garnish gave it a lot more appeal on the plate; next time I might add chopped green onions or fresh tomatoes as well. This definitely gets points from me for being a creative way to serve canned tuna, as those are hard to find! It is also a great way to use the crumbs at the bottom of the chip bag; I tend save them in a jar and after enough have gathered I use them in a casserole. Now I have another casserole to add to that rotation! Thanks so much for posting! Made for Newest Zaar Tag.