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This tender slow cooker onion soup pot roast is my go-to recipe when I want something satisfying and easy. With a simple combination of dry onion soup mix or canned French onion soup and condensed mushroom soup, the roast cooks down into a tender, flavorful meal with almost no effort. The potatoes and carrots simmer along with the beef, absorbing all the savory juices.
It’s a true set-it-and-forget-it recipe—perfect for busy days, cozy weekends, or anytime you want a hearty dinner ready when you walk in the door. The leftovers are just as delicious, and the sauce can be thickened on the stovetop for a rich, gravy-like finish.
What You’ll Like About This Dish
Hands-off cooking. The slow cooker does all the work.
Rich, savory flavor. Onion soup mix or canned onion soup adds deep beefy notes.
Full meal in one pot. Vegetables cook right alongside the roast.
Reliable and comforting. A classic pot roast that always turns out tender.
Ingredient Notes
- Chuck roast – Best choice for slow cooking because it becomes tender and flavorful.
- Red potatoes – Hold their shape well during long cooking.
- Carrots – Add sweetness and color to the dish.
- Condensed cream of mushroom soup – Creates a creamy, savory cooking sauce.
- French onion soup or onion soup mix – Provides deep onion flavor; either works well.
- Cornstarch or flour – Optional, for thickening the sauce after cooking.
Steps to Make Slow Cooker Onion Soup Pot Roast
- Place the roast in the slow cooker.
- Add the potatoes and carrots around the meat.
- Stir the soups together and pour over the roast and vegetables.
- Cook on high briefly, then reduce to low.
- Continue cooking until the roast is very tender.
- Transfer the cooking liquids to a saucepan and defat.
- Boil to reduce and concentrate the flavor.
- Thicken the sauce if desired.
Tips
Sear the roast first for extra flavor, if you have time.
Cut the potatoes in half so they cook evenly.
Use low-sodium soups if you prefer a less salty result.
Thicken the cooking liquid for a gravy-style sauce.
Recipe Variations
- Golden mushroom version. Use golden mushroom soup instead of cream of mushroom.
- Herb version. Add thyme, rosemary, or bay leaves to the slow cooker.
- Vegetable-heavy roast. Add onions, celery, or parsnips.
- Wine variation. Add a splash of red wine for richer flavor.
- Garlic version. Add whole peeled garlic cloves to the pot.
Serving Suggestions
- Serve with the vegetables and thickened sauce.
- Add a side of green beans or peas for color.
- Pair with crusty bread or soft yeast rolls.
- Garnish with fresh parsley.
How to Store
Refrigerate leftovers in an airtight container for up to 4 days.
Reheat gently on the stovetop or in the microwave, adding a splash of broth if needed.
Freeze the pot roast (without potatoes) for up to 3 months. Add fresh potatoes when reheating for the best texture.
You might like to try this slow cooker pot roast made with Italian seasonings and fresh ingredients, or this one, made with gravy and a variety of vegetables and seasonings.
Slow Cooker Onion Soup Pot Roast
Ingredients
- 3 pounds beef chuck roast
- 2 to 3 pounds small red potatoes, scrubbed, halved
- 4 large carrots, peeled and halved lengthwise and sliced into 3-inch lengths
- 1 (10.5-ounce) can cream of mushroom soup
- 1 (1-ounce) packet onion soup mix, *see the note, below
- 1 cup beef broth, low sodium
- 1 tbsp cornstarch, optional
- 1 tbsp cold water, optional
Recommended Equipment
Instructions
- Place the pot roast in the slow cooker.3 pounds beef chuck roast
- Arrange the potatoes and carrots around the roast.2 to 3 pounds small red potatoes (scrubbed, halved) | 4 large carrots (peeled and halved lengthwise and sliced into 3-inch lengths)
- Combine the soup, onion soup mix, and beef broth; pour the mixture over the roast and potatoes.1 (10.5-ounce) can cream of mushroom soup | 1 (1-ounce) packet onion soup mix (*see the note, below) | 1 cup beef broth (low sodium)
- Cover and cook on HIGH for 1 hour. Turn to LOW and cook for 6 to 8 hours longer, or until the roast is very tender.
- Skim the fat from the liquids or pour them into a fat separator. Return the defatted liquids to a saucepan and bring to a boil over medium-high heat. Continue boiling for 2 to 4 minutes, or until reduced slightly and the flavors are concentrated.
- Optional: To thicken the liquids, combine 1 tablespoon of cornstarch with 1 tablespoon of cold water. Mix until smooth; stir into the boiling broth and continue cooking until thickened.1 tbsp cornstarch (optional) | 1 tbsp cold water (optional)
Notes
Nutrition
Disclaimer:
Our nutritional information is based on a third-party application that analyzes the ingredients list to determine the values. The information is meant to be helpful, but should be considered an estimate. Values may differ depending on measurements, brands, serving variations, and database availability.
