Pour this 1 savory mixture evenly over the beef, mushrooms, and onions in the slow cooker. Using a wooden spoon or spatula, gently stir everything together right in the slow cooker until the meat and vegetables are well coated in the gravy mixture. This is your quick “hands-on” moment—the mixture should look creamy and a bit soupy at this stage.
Cover the slow cooker with the lid and cook on LOW for 7–8 hours or on HIGH for 4–5 hours, until the beef is very tender and the mushrooms have cooked down into the gravy.
Once cooked, give the stew a good stir to recombine the gravy and vegetables. Taste and adjust seasoning with a little more salt and pepper if needed.
Serve the beef and mushroom gravy stew hot over mashed potatoes, egg noodles, or rice, spooning extra gravy over the top.
For a creamier stew, stir in 1/4 to 1/2 cup sour cream or plain Greek yogurt at the very end of cooking, off the heat, for a stroganoff-style twist. If you want more veggies, add 2–3 chopped carrots or a handful of frozen peas during the last 30 minutes of cooking. To keep things dairy-free, swap the condensed cream of mushroom soup for a dairy-free cream of mushroom alternative or a thick homemade mushroom-onion gravy. For extra flavor, you can quickly brown the beef in a skillet before adding it to the slow cooker, but it’s totally optional for busy nights. If you’d like a thicker gravy, remove the lid during the last 20–30 minutes on HIGH, or stir in a slurry of 1 tablespoon cornstarch mixed with 2 tablespoons cold water and cook until thickened. This recipe also freezes well—cool completely, portion into containers, and freeze for up to 3 months for an easy heat-and-eat dinner.
