Used Better Than Bullion Beef with 8oz water instead of Broth, Half and Half instead of heavy cream, corn starch instead of flour, and had no onions so used about 1.5/2 tbsp of Onion Powder. Taste was great!
Used leftover steak from a previous dinner, this dish turned out amazing in my adaptation! I hope everyone else love it too! [BTW, I don't usually follow the letter of a recipe, it's there as a guide to the desired result by flavor]