My family's favorite pot roast that they've loved for years!
Place the beef or venison roast in the center of the crock pot. Place the onions, carrots, and mushrooms around the beef roast. Sprinkle with kosher salt and pepper.
In a bowl, whisk together the mushroom soup, onion soup mix, red wine, worcestershire sauce, and garlic. Pour over top of the beef roast and vegetables.
Cook on low for 6 to 8 hours. Microwave the mashed potatoes according to package directions. Serve over top of the mashed potatoes.