Onion Soup Mix Slow Cooker

Featured in: Comfort Baking

This slow cooker dish brings together tender chuck roast, hearty vegetables, and a savory onion soup mix to create a flavorful, comforting meal. The beef simmers slowly with a blend of broth, tomato paste, and Worcestershire sauce, allowing rich tastes to develop effortlessly. Vegetables like carrots, potatoes, celery, and onions soften and absorb the gravy, making each bite full of warmth. Optionally, cornstarch thickens the sauce for a luscious finish. Perfect for cozy dinners during chilly evenings, this dish highlights simple preparation and robust flavors.

Updated on Mon, 16 Feb 2026 20:13:25 GMT
A savory slow cooker pot roast made with onion soup mix, tender beef, and hearty vegetables in a rich gravy. Pin
A savory slow cooker pot roast made with onion soup mix, tender beef, and hearty vegetables in a rich gravy. | cinnamonnest.com

This Onion Soup Mix Slow Cooker Pot Roast is a hearty, comforting meal perfect for warming up chilly winter nights. Tender beef, flavorful vegetables, and a rich gravy come together effortlessly in the slow cooker to create a savory, melt-in-your-mouth dinner that requires very little active preparation.

A savory slow cooker pot roast made with onion soup mix, tender beef, and hearty vegetables in a rich gravy. Pin
A savory slow cooker pot roast made with onion soup mix, tender beef, and hearty vegetables in a rich gravy. | cinnamonnest.com

This American classic yields six generous servings and is designed for ease. Whether you're a beginner or a seasoned home cook, the simple ingredients and straightforward process ensure a perfect result every time the roast is served.

Ingredients

  • Beef: 3 lbs (1.4 kg) chuck roast, trimmed
  • Seasoning & Soup Mix: 1 packet (about 1 oz/28 g) onion soup mix, 1 tsp black pepper, 1 tsp dried thyme (optional)
  • Vegetables: 1 lb carrots (peeled and cut into 2-inch pieces), 1 lb baby potatoes (halved), 3 celery stalks (cut into 2-inch pieces), 1 large onion (cut into wedges)
  • Liquids: 2 cups (480 ml) beef broth, 2 tbsp tomato paste, 2 tbsp Worcestershire sauce
  • For Gravy (optional): 2 tbsp cornstarch, 2 tbsp cold water
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Instructions

Step 1
Pat the beef chuck roast dry with paper towels. Season with black pepper and optional dried thyme.
Step 2
Place the carrots, potatoes, celery, and onion in the bottom of the slow cooker.
Step 3
Lay the roast on top of the vegetables.
Step 4
In a bowl, whisk together beef broth, onion soup mix, tomato paste, and Worcestershire sauce. Pour this mixture over the roast and vegetables.
Step 5
Cover and cook on LOW for 8 hours (or HIGH for 5-6 hours), until the roast is fork-tender and vegetables are cooked through.
Step 6
Remove the roast and vegetables to a serving platter.
Step 7
To thicken the sauce, mix cornstarch with cold water, then stir into the slow cooker. Cover and cook on HIGH for 5-10 minutes until thickened.
Step 8
Slice or shred the roast, serve with vegetables and spoon the rich gravy over the top.

Zusatztipps für die Zubereitung

For the best results, use a slow cooker with at least a 6-quart capacity. For extra flavor, sear the roast in a hot skillet with a little oil before adding it to the slow cooker to develop a rich crust.

Varianten und Anpassungen

You can substitute parsnips or turnips for some of the potatoes if desired. To keep this recipe gluten-free, ensure you use a gluten-free onion soup mix and a gluten-free Worcestershire sauce.

Serviervorschläge

Serve this roast alongside crusty bread or creamy mashed potatoes to soak up the savory gravy. This hearty dish pairs exceptionally well with a robust red wine, such as a Cabernet Sauvignon.

Hearty onion soup mix pot roast with juicy beef and vegetables, slow-cooked to perfection for a comforting family dinner. Pin
Hearty onion soup mix pot roast with juicy beef and vegetables, slow-cooked to perfection for a comforting family dinner. | cinnamonnest.com

Each serving of this comforting meal contains approximately 420 calories, providing 38g of protein and 27g of carbohydrates, making it a balanced and filling choice for your next dinner.

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Keeps paper towels accessible for wiping spills, drying hands, and cleaning surfaces while cooking.
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Recipe FAQ

Can I sear the beef before slow cooking?

Yes, searing the beef in a hot skillet before placing it in the slow cooker enhances the flavor and adds a rich crust.

What can I substitute for baby potatoes?

Parsnips or turnips work well as alternatives, offering a similar texture and slightly different flavor profile.

How do I thicken the gravy?

Mix cornstarch with cold water and stir it into the slow cooker near the end of cooking. Cook on high for 5-10 minutes until thickened.

Is it possible to prepare this dish gluten-free?

Yes, by using a gluten-free onion soup mix and ensuring Worcestershire sauce is gluten-free, the dish remains safe for gluten-sensitive diets.

What side dishes pair well with this pot roast?

Crusty bread or mashed potatoes complement the savory gravy and tender meat beautifully.

Onion Soup Mix Slow Cooker

Slow-cooked beef and veggies infused with rich onion flavors for a satisfying, tender dish.

Prep duration
15 min
Cooking duration
480 min
Total duration
495 min

Category Comfort Baking

Difficulty Easy

Origin American

Yield 6 Servings

Dietary requirements Dairy-free

Ingredients

Beef

01 3 lbs chuck roast, trimmed

Seasoning & Soup Mix

01 1 packet (1 oz) onion soup mix, gluten-free if needed
02 1 teaspoon black pepper
03 1 teaspoon dried thyme, optional

Vegetables

01 1 lb carrots, peeled and cut into 2-inch pieces
02 1 lb baby potatoes, halved
03 3 celery stalks, cut into 2-inch pieces
04 1 large onion, cut into wedges

Liquids

01 2 cups beef broth
02 2 tablespoons tomato paste
03 2 tablespoons Worcestershire sauce

Gravy Thickener (Optional)

01 2 tablespoons cornstarch
02 2 tablespoons cold water

Directions

Step 01

Prepare the roast: Pat the chuck roast dry with paper towels. Season with black pepper and dried thyme if using.

Step 02

Layer vegetables: Place carrots, potatoes, celery, and onion in the bottom of the slow cooker.

Step 03

Position the roast: Lay the roast on top of the vegetables.

Step 04

Combine liquid ingredients: In a bowl, whisk together beef broth, onion soup mix, tomato paste, and Worcestershire sauce. Pour over the roast and vegetables.

Step 05

Cook the pot roast: Cover and cook on LOW for 8 hours (or HIGH for 5-6 hours), until the roast is fork-tender and vegetables are cooked through.

Step 06

Transfer to serving platter: Remove the roast and vegetables to a serving platter.

Step 07

Thicken the gravy (optional): Mix cornstarch with cold water, then stir into the slow cooker. Cover and cook on HIGH for 5-10 minutes until thickened.

Step 08

Finish and serve: Slice or shred the roast, serve with vegetables and spoon gravy over the top.

Necessary tools

  • Slow cooker, at least 6-quart capacity
  • Knife and cutting board
  • Mixing bowl
  • Whisk
  • Serving platter

Allergy information

Review ingredients carefully for potential allergens and consult with a healthcare provider if you're uncertain.
  • Contains soy from Worcestershire sauce and possibly soup mix
  • May contain gluten unless using gluten-free soup mix and Worcestershire sauce
  • Double-check ingredient labels for gluten and soy content if allergies are a concern

Nutritional information (per serving)

These values are approximate guidelines only and shouldn't replace professional medical advice.
  • Calories: 420
  • Fat: 18 g
  • Carbs: 27 g
  • Protein: 38 g