To start, in a large braiser or heavy-bottomed dutch, oven over medium-high heat, sauté the onions and mushrooms in butter for a few minutes.
Add the ground beef, season with salt and pepper, to taste.
Once the beef if cooked through, add the garlic, Worcestershire sauce, dijon mustard, and thyme. Stir to combine. Check for salt and pepper. Add more if you like.
Add the egg noodles and broth, simmering and stirring often, until the noodles are cooked to just al dente. Remove from heat and stir in sour cream.
Enjoy!
Notes
The broth should almost cover the noodles, but not quite. Add more broth if needed. No noodle is made the same and some may require a little more liquid to cook. While the noodles simmer, make sure you stir often.