Step 1

Spray a 4 to 6-quart slow cooker with nonstick cooking spray. Add the brown gravy mix, au jus mix, and water to the slow cooker and whisk to combine. Add the meat and stir to combine. Try to get all the meat covered with liquid as much as possible. Cover and cook on low for 6 to 8 or on high for about 5 hours or until the beef is tender.

Step 2

About 30 minutes before serving, ladle about 1/2 cup of the gravy from the slow cooker into a small bowl. Add the sour cream and stir to combine. Add the sour cream mixture back to the slow cooker and stir to combine. Cook covered on high for about 20 minutes.

Step 3

Cook the egg noodles according to the package instructions. Serve the beef and gravy over the hot noodles. You can also add the noodles to the slow cooker and stir together.