This tender, juicy Slow Cooker Beef Manhattan is piled high on garlic toast with creamy mashed potatoes and smothered in rich, savory gravy for the ultimate open-faced comfort sandwich. I first made it on a Sunday afternoon when I wanted something hearty and warming without a lot of fuss, and it's been a cold-weather favorite ever since. The beef simmers all day in onion soup mix, brown gravy, and red wine vinegar, breaking down into fork-tender shreds that soak up all that savory, tangy flavor.
If you love easy, comforting slow cooker meals, you'll also enjoy my Mongolian Ground Beef and Cabbage and Cowboy Chicken Pasta for quick weeknight dinners that come together with minimal effort.
Why You will Love This Slow Cooker Beef Manhattan
This beef Manhattan is everything you want in a comfort meal: it's rich, savory, and so satisfying. The chuck roast breaks down into tender, juicy shreds after hours in the slow cooker, and the onion soup mix and brown gravy create a deeply flavorful au jus that you pour over the whole thing. The mashed potatoes add creamy richness, and the garlic toast gives you a crispy, buttery base that holds everything together. It's perfect for busy weeknights because the slow cooker does all the work, and it's hearty enough to serve for Sunday dinner or a cozy family meal.
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Slow Cooker Beef Manhattan Ingredients
Here's everything for the tender beef, savory gravy, and hearty toppings.
See Recipe Card Below This Post For Ingredient Quantities
- Beef chuck roast: Two to three pounds cut into large chunks. Chuck roast is perfect for slow cooking because it has enough fat and connective tissue to break down into tender, juicy shreds.
- Onion soup mix: One packet adds savory, oniony flavor and helps season the beef as it cooks.
- Brown gravy mix: One packet creates a rich, savory au jus that coats the beef and makes the perfect gravy for pouring over the whole dish.
- Red wine vinegar: Adds acidity and a subtle tang that balances the richness of the beef and gravy.
- Prepared mashed potatoes: Four cups of creamy, buttery mashed potatoes add richness and make the sandwich even more filling. You can use homemade or store-bought.
- Prepared garlic toast: Six to eight slices provide a crispy, buttery base for the open-faced sandwiches. Use frozen garlic toast or make your own.
How to Make Slow Cooker Beef Manhattan
Follow these steps for tender, flavorful beef and a hearty, comforting open-faced sandwich.
- Add the beef to the slow cooker: Place the chuck roast pieces into a 4-quart slow cooker.
- Season the beef: Sprinkle the onion soup mix and brown gravy mix evenly over the beef chunks. Make sure all the pieces are coated.
- Add the vinegar: Pour the red wine vinegar over the top. The vinegar will help tenderize the beef and add a subtle tang to the gravy.
- Cook: Cover the slow cooker and cook on low for 6 to 8 hours, or on high for 4 hours. The beef is done when it's fork-tender and falls apart easily.
- Shred the beef: Once the beef is tender, use two forks to shred it into bite-sized pieces. Leave the beef in the slow cooker with the au jus so it stays moist and flavorful.
- Assemble the sandwiches: Place a slice of garlic toast on each plate. Add a generous scoop of mashed potatoes on top of the toast. Top with a heaping portion of shredded beef, then ladle the au jus from the slow cooker over the top.
- Serve: Serve immediately while the garlic toast is still crispy and the beef is hot and juicy.
Substitutions and Variations
Here are a few simple swaps and add-ins to make this beef Manhattan your own.
Beef chuck roast: You can also use a rump roast, bottom round, or even short ribs if you prefer. Just make sure it's a cut that becomes tender with slow cooking.
Onion soup mix: Make your own by mixing dried minced onion, onion powder, garlic powder, salt, and a pinch of sugar.
Brown gravy mix: Use a homemade gravy made with beef broth, butter, flour, and seasonings if you want to skip the packet.
Red wine vinegar: Swap it for balsamic vinegar, apple cider vinegar, or even a splash of red wine.
Mashed potatoes: Use regular mashed potatoes, garlic mashed potatoes, or even mashed cauliflower for a low-carb option.
Garlic toast: Use regular toasted bread, Texas toast, or even dinner rolls if you don't have garlic toast.
Add vegetables: Toss in sliced mushrooms, diced carrots, or pearl onions to the slow cooker for extra flavor and nutrition.
Make it richer: Stir a tablespoon of butter or a splash of heavy cream into the au jus before serving.
Top it with cheese: Sprinkle shredded mozzarella or provolone over the beef before serving for a cheesy twist.
Equipment
Here's what makes this recipe come together smoothly.
- 4-quart slow cooker: Large enough to hold the beef and allow the flavors to develop as it cooks.
- Two forks: For shredding the beef once it's tender.
- Plate for serving: For assembling the open-faced sandwiches.
- Spoon or ladle: For serving the mashed potatoes and au jus.
How to Store Slow Cooker Beef Manhattan
This beef stores beautifully and reheats well.
Refrigerator: Store the shredded beef and au jus separately in an airtight container for up to 4 days. Store the mashed potatoes separately as well.
Freezer: Freeze the beef and au jus together in a freezer-safe container for up to 3 months. Thaw in the fridge overnight before reheating. Mashed potatoes don't freeze well, so make those fresh when you're ready to serve.
Reheating: Warm the beef and au jus gently in a saucepan or microwave until heated through. Reheat the mashed potatoes separately, adding a splash of milk or butter if they've dried out. Toast the garlic bread fresh.
Serving Suggestions
This beef Manhattan is a complete meal on its own, but here are a few ways to round it out.
- Serve with a simple green salad or steamed green beans on the side.
- Add roasted carrots, Brussels sprouts, or asparagus for extra vegetables.
- Pair it with a cup of beef vegetable soup or French onion soup as a starter.
- Serve with a glass of red wine or iced tea.
If you're planning a cozy dinner spread, this pairs wonderfully with my Loaded Scrambled Eggs or Chicken Shawarma for a comforting, hearty meal.
Expert Tips
Here's what I've learned after making this beef Manhattan many times.
Use chuck roast: It has the perfect balance of fat and connective tissue to break down into tender, juicy shreds. Leaner cuts will be dry.
Cut the beef into large chunks: Cutting it into 3- to 4-inch pieces before cooking helps it cook more evenly and makes it easier to shred later.
Don't skip the vinegar: The acidity helps tenderize the beef and balances the richness of the gravy.
Cook on low for best results: Low and slow gives you the most tender, flavorful beef. High works in a pinch, but low is better.
Shred the beef in the slow cooker: Leave it in the au jus so it stays moist and soaks up all that flavor.
Assemble just before serving: The garlic toast gets soggy if you assemble the sandwiches too early, so build them right before you eat.
Make extra: This recipe doubles easily if you're feeding a crowd or want leftovers for the week.
Taste the au jus: If it's too salty, add a splash of water or beef broth to dilute it.
FAQ
Chuck roast is the best cut because it has enough fat and connective tissue to become tender and juicy during slow cooking. Rump roast or bottom round also work, but chuck is the most flavorful and forgiving.
Yes, you can put raw beef directly into the slow cooker. You don't need to brown it first, although browning can add extra flavor. For this recipe, the beef goes in raw, and the slow cooker does all the work.
A beef Manhattan is an open-faced sandwich made with tender roast beef, mashed potatoes, and gravy, all piled on top of toasted bread. It's similar to a hot roast beef sandwich but with the addition of mashed potatoes, making it extra hearty and comforting.
Common mistakes include using the wrong cut of beef (lean cuts get dry), cooking on high when low is better (low and slow is more tender), opening the lid too often (releases heat and extends cooking time), and not adding enough liquid (the beef can dry out). For this recipe, chuck roast, low heat, and the au jus from the gravy mix keep everything moist and flavorful.
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Slow Cooker Beef Manhattan
Ingredients
Method
- Place beef chunks into a 4-quart slow cooker.
- Sprinkle onion soup mix and brown gravy mix evenly over the beef.
- Pour red wine vinegar over the top of the beef.
- Cover the slow cooker and cook on low for 6–8 hours or on high for 4 hours until beef is tender.
- Shred the beef using two forks, keeping the cooking juices (au jus) in the slow cooker.
- To assemble: Place garlic toast slices on plates.
- Spread a layer of mashed potatoes on each slice of toast.
- Top with shredded beef and spoon some of the au jus over the top.
- Serve hot immediately.
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