French Onion Beef Stew Slow Cooker Recipe with Gravy

French onion beef stew is a slow-cooked, hearty take on French onion soup, with tender beef, sweet browned onions, vegetables, and savory broth. It is served as a complete meal, or topped with toasted bread and melted cheese for a soup-inspired finish; the exact ingredients vary from kitchen to kitchen.

Ingredients

2½ lb boneless beef chuck, cut into 1½-inch cubes (1.13 kg)
1½ tsp fine salt (7 g), plus more to taste
½ tsp black pepper (1 g)
⅓ cup all-purpose flour (40 g)
1 tbsp neutral oil, such as canola (15 ml)
3 large yellow onions, thinly sliced (about 900 g)
2 tbsp unsalted butter (28 g)
3 medium carrots, cut into 1-inch pieces (about 300 g)
1½ lb baby potatoes, halved if larger than 1½ inches (680 g)
3 garlic cloves, minced (about 9 g)
1 tbsp tomato paste (16 g)
3 cups low-sodium beef broth (710 ml)
1 tbsp Worcestershire sauce (15 ml)
1 tsp dried thyme (1 g), or 1 tbsp fresh thyme leaves (about 3 g)
1 bay leaf
1 tbsp cornstarch mixed with 1 tbsp cold water (8 g cornstarch and 15 ml water), optional, for a thicker gravy

Instructions

Prepare the beef and vegetables, about 10 minutes. Pat the beef dry with paper towels so it browns instead of steaming. Trim away any unusually large, hard pieces of fat, then season the cubes with the salt and pepper. Sprinkle the flour over the beef and toss until the pieces have a light, even coating. Slice the onions, cut the carrots, and halve any large potatoes. Keep the vegetables in fairly even pieces so they cook at a similar rate.
Brown the beef, about 12 minutes. Heat the oil in a large skillet over medium-high heat. Working in two batches, brown the beef on two or three sides, turning as needed; allow about 5 to 6 minutes per batch. It does not need to cook through at this stage. Crowding the pan traps steam and prevents good browning, so leave space around the cubes. Transfer the browned beef to a 6-quart slow cooker, scraping in any browned bits that cling to the skillet.
Soften and brown the onions, about 18 minutes. Reduce the skillet heat to medium and add the butter and sliced onions. Cook, stirring every few minutes and scraping the pan, until the onions are soft and deeply golden at the edges, about 15 minutes. They will continue to cook in the slow cooker, so they do not need to become dark or jammy. Stir in the garlic and tomato paste for the final minute. If the pan looks dry or the onions begin to catch, add a tablespoon of water and lower the heat slightly.
Assemble the stew, about 5 minutes. Scrape the onion mixture into the slow cooker. Add the carrots and potatoes, then pour in the broth and Worcestershire sauce. Stir in the thyme and tuck in the bay leaf. The liquid should come partway up the ingredients; the vegetables and beef release moisture as they cook, so the pot does not need to be filled to the top with broth. Cover and cook on low for 8 hours, until the beef is fork-tender and the potatoes are cooked through. USDA FSIS lists 145°F (63°C) with a 3-minute rest as the safe minimum for whole cuts of beef; check a thick beef cube with a food thermometer, and in this stew allow the beef to cook until tender.
Adjust the gravy if needed. Remove and discard the bay leaf. If you would like a thicker gravy, stir the cornstarch and cold water together until smooth. Stir the slurry into the hot stew, cover, and cook on high for 10 to 15 minutes, until the broth thickens. This optional wait adds 10 to 15 minutes to the total time. Taste and adjust the salt and pepper before serving.

Tips

Brown in batches. Searing builds a deeper, roasted flavor and gives the broth more complexity. If you are short on time, you can skip it and add the seasoned, flour-coated beef directly to the slow cooker, but expect a milder flavor and a less developed gravy.
Slice onions evenly. Thin, consistent slices soften at about the same pace. Keep the skillet at medium heat rather than rushing the process over high heat; burnt onion edges can make the finished broth taste bitter.
Use a suitable cooker size and thawed beef. A 6-quart slow cooker gives the ingredients room to cook evenly. Do not fill it beyond the manufacturer’s recommended level, and thaw frozen beef in the refrigerator before cooking rather than putting it into the slow cooker frozen.
Choose the thickener to suit your taste. The flour on the beef lightly thickens the cooking liquid, but slow cookers trap moisture, so the gravy may still be loose. Use the optional cornstarch slurry for a more spoon-coating finish; add it only after the beef and vegetables are tender.

Serving Suggestions

Serve the stew in warm bowls with crusty bread, which is useful for soaking up the onion-rich gravy. For a French onion soup-style topping, spoon the stew into oven-safe bowls, add a slice of toasted baguette and a handful of grated Gruyère, then broil until the cheese melts and bubbles. Keep the bowls under the broiler only if they are explicitly labeled oven-safe, and use care when serving because they will be very hot. A simple green salad or steamed green beans provide a fresh contrast to the rich broth.

If you are serving the stew without cheese, chopped parsley or a little fresh thyme makes a simple garnish. A spoonful of Dijon mustard at the table is another optional accent; start with a small amount so it complements, rather than covers, the beef and onion flavors.

Variations

Make it without flour. Skip the flour coating and brown the seasoned beef as directed. The broth will be thinner; thicken it at the end with the cornstarch slurry, or leave it as a lighter, brothy stew. For a gluten-free version, check that the broth and Worcestershire sauce are labeled gluten-free and use cornstarch rather than wheat flour.
Swap the vegetables. Parsnips can replace some or all of the carrots, while turnips can stand in for some of the potatoes. Cut root vegetables into similarly sized pieces. Softer vegetables such as peas are best stirred in during the final 20 to 30 minutes so they retain their color and texture.
Change the cheese topping. Gruyère is a classic choice for the soup-inspired finish, but Swiss cheese or provolone also melts well. The flavor will be a little milder or sharper depending on the cheese. The cheese and toast are optional serving additions, not necessary for the stew itself.
Use a different cut of beef. Beef stew meat can work if it is cut from a suitable braising cut, though the pieces may vary in size and tenderness. Chuck is a dependable choice because its connective tissue softens during the long cook. Lean steaks are less suitable: they can become dry and firm after hours in the slow cooker.

Storage and Reheating

Refrigerate leftover stew within 2 hours of cooking. Divide a large batch among shallow, covered containers so it cools promptly, then keep it refrigerated for 3 to 4 days. The potatoes may soften somewhat as they sit, but the onion and beef flavors often blend further. If the stew thickens in the refrigerator, loosen it with a splash of broth or water when reheating.

For longer storage, freeze the cooled stew in airtight, freezer-safe containers for about 2 to 3 months for best quality. Leave a little space at the top for expansion, and thaw it in the refrigerator before reheating. Reheat on the stovetop over medium heat, stirring occasionally, or microwave individual portions in a covered, microwave-safe dish. In either case, heat leftovers to 165°F (74°C), checking the center with a food thermometer. Avoid repeatedly warming and cooling the same pot; reheat only the portion you plan to serve.

Frequently Asked Questions

Can I put the beef in without browning it first?

Yes. Browning is for flavor and color, not a requirement for the slow cooker to cook the stew. Add the seasoned beef directly to the pot if you prefer fewer dishes, but the broth will taste less roasted and may look lighter. Do not skip thawing the beef first.

Can I cook this stew on high instead of low?

Low heat for 8 hours is the timing used for this recipe and gives the chuck time to become tender without rushing. Slow cookers vary, but many can cook a similar stew on high in about 4 to 5 hours. Check for fork-tender beef and cooked potatoes rather than relying only on the clock; if the meat is still firm, continue cooking.

Why is my slow cooker gravy thin?

Slow cookers hold in steam, and vegetables release liquid as they cook, so a stew can finish with more broth than expected. Stir in the optional cornstarch slurry and cook on high for 10 to 15 minutes. If you prefer not to use cornstarch, remove the lid for a short time only if your slow cooker instructions allow it, or serve the broth as-is with bread.

Can I use frozen beef or vegetables?

Thaw beef in the refrigerator before adding it to the slow cooker; starting with frozen meat can keep the contents at an unsafe temperature for too long. Frozen vegetables can be used in some cases, but they may add extra moisture and become softer. For the most predictable texture, use thawed beef and fresh root vegetables.

Can I make the stew ahead?

Yes. Cook it fully, refrigerate it promptly, and reheat portions to 165°F (74°C) before serving. You can also prepare the onions and cut the vegetables a day ahead, keeping them covered in the refrigerator; brown the beef and assemble the slow cooker when you are ready to cook. Do not leave prepared meat or vegetables at room temperature while waiting.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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