This is a fast food homemade kinda post and one of those recipes where I can't really tell you what to use cause it's so customizable. The technique is what you have to get down. You layer the ingredients starting with cheese and ending with cheese. I put the greek yogurt side of the tostada down and put the cheese (which acts as glue) on top. You can substitute sour cream for greek yogurt if you have it. I just had greek yogurt leftover from making some greek pitas a few nights before. You want to make sure that this is completely wrapped in tortilla, so if when you're done folding you have a whole just trim a little of the excess tortilla off one side to cover it up. You want to keep all the goodness wrapped inside! If you don't have a George Foreman or panini press you can make these in the skillet seam side down then flip when browned. My mom had the idea of using Doritos as the crunch instead of the tostada and I think I will try that for lunch!