Smothered Filet Mignon on allrecipes.
I cooked it exactly as written (hot side vs side to melt cheese on), and used "regular" dijon mustard instead of grainy like the person who submitted it then reviewed it said. I also used less onion (Chris isn't a huge onion fan), pretty much just 2 slightly larger than a golfball ones and used gorgonzola instead of blue cheese. Dad and Chris both commented multiple times how tasty it was. I even loved it and I'm not a huge meat eater. It was very tender, very yummy. Costco filets yay!