remove the casserole dish from the oven and take off the foil, watching out for hot steam. Give the beef and sauce a gentle stir to re-coat the pieces and even out the texture of the gravy.
Taste and adjust seasoning if desired (the onion soup mix is salty, so you may not need additional salt). Let the dish rest for about 5 minutes, then serve the creamy mushroom beef over mashed potatoes, noodles, or rice.
Variations & Tips
For a slightly lighter version, you can substitute one can of cream of mushroom soup with low-sodium beef broth, keeping the same overall liquid volume by using a bit less added water. If you enjoy a deeper mushroom flavor, stir in 1 to 2 cups of sliced fresh mushrooms directly over the beef before you pour on the soup mixture. For a more herb-forward profile, add 1 teaspoon of dried thyme
