Step 1

Preheat the slow cooker while you prepare the rest of the ingredients.

Step 2

Spread half the onions and mushrooms on the bottom of a slow cooker, followed by the steaks. Sprinkle the steaks with the onion soup mix, flipping them over to coat both sides with the seasoning.

Step 3

Spread the remaining onions and mushrooms on top, then pour in the beef broth.

Step 4

Cover and cook on low for 8 hours. Remove about 1/4 cup of the juices from the crock pot. Whisk in the cornstarch to form a slurry. Stir the slurry back into the slow cooker, turn the heat up to high, and continue to cook uncovered, stirring occasionally, another 15-20 minutes, or until juices are thickened. Season to taste with salt and pepper.