Slow Cooker
Mushroom Roast
A tender, fall-apart beef roast slow cooked all day in a rich onion mushroom broth with a full container of fresh mushrooms, sliced onion, and garlic. The cooking liquid becomes a deeply savory gravy that's absolutely made to be spooned over cauliflower mash. Set it up in the morning — dinner takes care of itself.
- 2 lb beef roast
- 8 oz fresh mushrooms, sliced (or 1 can, drained)
- 1 yellow onion, sliced
- 3 cloves garlic, minced
- 1 packet Lipton Onion Mushroom soup mix
- 1 cup water
- ¼ tsp salt
- ½ tsp black pepper
- — cooking spray
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1
Sear the roast
Pat the roast dry with paper towels and season all over with salt and pepper. Heat a large skillet over high heat and sear the roast for 2–3 minutes per side until deeply browned. This step builds the foundation of flavor for the entire dish and is worth the extra 10 minutes.
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2
Build the broth
Spray the slow cooker with cooking spray. In a small bowl, whisk together the Lipton Onion Mushroom soup mix packet and 1 cup of water until combined. Pour into the bottom of the slow cooker.
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3
Layer & cook
Place the seared roast in the slow cooker. Scatter the minced garlic, sliced onion, and mushrooms over and around the roast. Cover and cook on low for 6–7 hours until the meat is completely tender and pulls apart easily with a fork.
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4
Rest & serve
Remove the roast and let it rest for 5 minutes before slicing or pulling apart. The cooking liquid in the slow cooker has transformed into a rich, savory mushroom gravy — spoon it generously over the meat and serve over cauliflower mash to soak up every drop.
- Sear before you slow cook: The deep browning you get from searing creates layers of flavor that simply don't develop in a slow cooker — it's the single best upgrade you can make to any slow cooker roast recipe. Don't skip it.
- Add more vegetables: This roast is a great opportunity to bulk up the meal with low-carb vegetables. Add a cup of halved radishes, a few stalks of chopped celery, or a handful of green beans right alongside the mushrooms — they'll be perfectly tender after 6 hours and soak up the mushroom gravy beautifully.
- Cauliflower mash is the move: The rich mushroom and onion gravy that develops in the slow cooker is exceptional spooned over cauliflower mash — it makes this feel like a proper Sunday dinner completely on plan. Don't skip serving it over something that can catch that gravy.
- Low and slow is better: 6–7 hours on low produces noticeably more tender, flavorful meat than a shorter cook on high. If your schedule allows, always go low and slow with a tough cut like this.
- Leftovers: Slice or shred leftover roast and store with the gravy in the fridge for up to 4 days — it reheats beautifully and the flavors deepen overnight. Reheat gently on the stovetop with a splash of water if the gravy has thickened too much.