French Onion Roast {Slow Cooker Recipe}

Slow Cooker French Onion Roast is simple yet full of flavor. Perfect comfort food on a chilly winter night. Simple ingredients slow cook all day to make the richest, most delicious pot roast.

Slow Cooker French Onion Roast is simple yet full of flavor. Perfect comfort food on a chilly winter night.

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I really love fresh summer food, but I’ve got to tell you, not much beats a roast that’s slow cooked for hours on a chilly night.

For me, that’s the ultimate in comfort food.

Slow Cooker French Onion Roast is simple yet full of flavor. Perfect comfort food on a chilly winter night. Simple ingredients slow cook all day to make the richest, most delicious pot roast.

Ingredients for French Onion Roast

  • Chuck roast: I personally love a chuck roast for slow cooking. As it slowly cooks, it breaks down and becomes SO tender.
  • French onion soup mix: Adds so much rich onion flavor.
  • Beef broth: Rather than water, I use beef broth to enhance the beefy flavor. It makes the gravy incredibly rich.
  • Worcestershire sauce: Again, adds more dimension and richness to the sauce.
  • Dijon mustard: Cuts the richness and adds a little sharp tang.
  • Butter: Because it makes all things better.
  • Black pepper: I like lots of pepper on my beef roasts. I kept the amount standard here but feel free to add more if you’re a pepper lover.
  • Vegetable oil: For searing the beef before adding it to the slow cooker. This makes it even more tender and juicy.
  • Kosher salt: To bring out the flavors in the dish.
  • Cornstarch: Used at the end to thicken the liquid into a rich, glossy gravy.
Slow Cooker French Onion Roast is simple yet full of flavor. Perfect comfort food on a chilly winter night. Simple ingredients slow cook all day to make the richest, most delicious pot roast.

How to Make French Onion Roast

Start by heating a large skillet or dutch oven over medium-high heat. Add the vegetable oil.

Pat the roast dry with a paper towel. Season both sides with salt and pepper. Add to the hot skillet and sear, about 2 to 3 minutes per side, until a crust forms.

Once seared, add to your slow cooker. While the pan is still hot, add the beef broth and scrape the bottom of the pan with a wooden spoon to get all the bits off. There is major flavor there so don’t miss out on them.

Remove from heat and whisk in the French onion soup mix, Worcestershire sauce, Dijon mustard and butter. Pour over the roast in the slow cooker.

Set to cook for 4 to 5 hours on high or 6 to 8 hours on low. Once it’s fall apart tender, remove from the slow cooker to a plate.

In a small bowl whisk together cornstarch and water to make a slurry. Stir into the slow cooker then place the roast back. Cook another 10 minutes to thicken the liquid into a gravy.

Slow Cooker French Onion Roast is simple yet full of flavor. Perfect comfort food on a chilly winter night. Simple ingredients slow cook all day to make the richest, most delicious pot roast.

Reheats Like a Dream

Sometimes leftovers fall flat but this French Onion Roast reheats and tastes just as good, if not better, than on the first day.

And listen, this is coming from someone who is not keen on leftovers. I mean I eat them, but I don’t love it.

So this would be a great option for meal prepping lunches. Or to make a big batch and eat throughout the week if you like that kind of thing.

What to Serve with French Onion Roast

My immediate go to for this roast is mashed potatoes or thick egg noodles. Basically anything you can drench in the gravy.

To bring in a little health, roasted carrots or shaved brussels sprouts salad would be a great accompaniment.

A big glass of red wine would round things out for the ultimate in cozy comfort meal.

Slow Cooker French Onion Roast is simple yet full of flavor. Perfect comfort food on a chilly winter night. Simple ingredients slow cook all day to make the richest, most delicious pot roast.

More Cozy Dinner Ideas:

Slow Cooker French Onion Roast is simple yet full of flavor. Perfect comfort food on a chilly winter night. Simple ingredients slow cook all day to make the richest, most delicious pot roast.
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French Onion Roast

Slow Cooker French Onion Roast is simple yet full of flavor. Perfect comfort food on a chilly winter night.
Prep Time10 mins
Active Time8 hrs
Total Time8 hrs 10 mins
Course: Main Course
Cuisine: American
Keyword: french onion roast
Yield: 6 servings
Author: Meg’s Everyday Indulgence

Equipment

  • Slow Cooker

Ingredients

  • 1 Tbsp. vegetable oil
  • 1 tsp. kosher salt
  • 1 1/2 tsp. black pepper, divided
  • 2 1/2 lb. chuck roast
  • 1 pkg. onion soup mix
  • 1 14.5 oz. can beef broth
  • 1 Tbsp. worcestershire sauce
  • 1 Tbsp. Dijon mustard
  • 2 Tbsp. butter
  • 2 Tbsp. cornstarch
  • 2 Tbsp. cold water

Instructions

  • Heat a large skillet over medium-high heat. Season roast with kosher salt and 1 teaspoon black pepper. Add vegetable oil to hot skillet. Add roast and sear each side, about 2 mintues per side.
  • Meanwhile, add soup mix, beef broth, worcestershire sauce, Dijon mustard, butter and remaining 1/2 teaspoon pepper. Whisk well. Once done searing the roast, add it to the slow cooker. Flip so both sides get coated in the sauce.
  • Cook on low for 6 to 8 hours or high for 4 to 5 hours.
  • After time has elapsed, remove the roast from the slow cooker to a plate. In a small bowl, whisk together the cornstarch and cold water. Add to slow cooker and whisk well. Return roast to slow cooker and cook another 10 minutes, until sauce is thickened and glossy.

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