This is surprisingly good for a lower-fat recipe. I actually had reduced-sodium bacon, reduced fat sour cream and cheese (only because it was on sale), but I used regular condensed cream of mushroom soup. I will post this as written, but feel free to substitute with items that are not low-fat or non-fat. I used a non-fat cheddar because I didn't have the four cheese blend, but I must confess that regular cheese melts better, and I prefer the texture. I'm not familiar with the classic melts for cheese blend, but my guess is it melts like regular cheese. I wanted it for breakfast so I skipped refrigerating overnight, and it still tasted delicious. This would be a great recipe to prepare in the evening to have ready for breakfast the next day. Recipe courtesy of Cooking Light.