Crockpot French Dip Sandwiches

I'm a sandwich girl through and through, and anytime French dip is on the menu, you better believe I'm ordering it. These crockpot French dip sandwiches bring that restaurant favorite right to your kitchen in the easiest way!

We're keeping the prep simple with chuck roast, a packet of French onion soup mix, and beef broth. Let the slow cooker handle the beef, then spend a few minutes assembling the sandwiches when you're ready to eat.

As a Southern dietitian, I love a dinner that makes comfort food feel doable on a busy weeknight. The Cajun mayo adds a little Southern personality without making the recipe complicated!

If you're looking for more easy slow cooker dinners, try my crock pot beef tips or crockpot gumbo!

Why You'll Love This Recipe

• Easy, mostly hands-off dinner: Toss a few ingredients into the slow cooker in the morning, then come back to tender beef that's ready for sandwiches.
• Restaurant-style sandwiches at home: Toasted ciabatta, juicy shredded beef, and melty provolone give you that French dip experience without leaving the house.
• No separate au jus packet needed: The seasoned cooking liquid becomes a savory dipping sauce, so you're getting double duty out of the ingredients already in the crockpot.
• A Southern-inspired twist: The quick Cajun Dijon mayo adds a creamy, tangy kick that makes these sandwiches a little different from your usual French dip.
• Perfect for busy nights or game day: Make the beef ahead of time and let everyone build their own sandwich when they're ready to eat!

Ingredients for Crock Pot French Dip Sandwiches

We're letting a few pantry shortcuts do the heavy lifting, because a good French dip doesn't need to be complicated.

• Beef chuck roast: Choose a well-marbled chuck roast because it becomes tender and easy to shred as it cooks, making it ideal for slow cooker sandwiches.
• French onion soup mix: Dry French onion soup mix brings plenty of savory onion flavor without requiring you to chop onions or make a separate seasoning blend.
• Beef broth: Low-sodium beef broth keeps the roast moist as it cooks and combines with the beef juices to create the au jus for dipping.
• Worcestershire sauce: Just a tablespoon adds another layer of savory flavor to the beef and broth without complicating the recipe.

• Ciabatta rolls: I love ciabatta for this recipe because the sturdy crust and chewy texture hold up to the juicy beef, especially after a quick toast under the broiler.
• Provolone cheese: Its mild, creamy flavor complements the seasoned beef, and it melts beautifully over the sandwiches without overpowering the au jus.
• Cajun Dijon mayo: A quick mix of mayonnaise, Dijon mustard, Cajun seasoning, and lemon juice creates a creamy, tangy spread with a little Southern-inspired kick that balances the rich beef and cheese. 

See the recipe card below for the full list of ingredients and measurements.

Substitutions & Variations

The classic beef-and-cheese combo is hard to beat, but here are a few easy ways to make them your own.

• If you can't find ciabatta, swap the bread for sturdy hoagie rolls, French rolls, or sub rolls that can hold up to the juicy beef.
• You can change the cheese to Swiss, mozzarella, or white cheddar if provolone isn't your favorite.
• For a different seasoning blend, try Old Bay mayo in place of the Cajun version for a savory, slightly different spin on the spread.
• If you like a little extra kick, make the mayo spicy with a pinch of cayenne or a few dashes of hot sauce.
• For a more traditional sandwich, skip the Cajun mayo and stick with the shredded beef, melted cheese, and warm au jus.

How to Make Slow Cooker French Dip Sandwiches

Get the beef going in the morning, then come dinnertime, just assemble and you're done!

Step 1: Place the chuck roast in a 7-quart slow cooker and sprinkle the dry French onion soup mix evenly over the beef.

Step 2: Pour the beef broth, water, and Worcestershire sauce around the roast, then cover with the lid.

Step 3: Cook on LOW for approximately 8 to 10 hours or HIGH for 5 to 6 hours, until the beef is fork-tender and shreds easily.

Step 4: While the beef cooks, stir together the mayonnaise, Dijon mustard, Cajun seasoning, and lemon juice in a small bowl, then refrigerate until ready to serve.

Step 5: Transfer the cooked roast to a cutting board or large bowl and shred it with two forks. You will want to discard any large pieces of excess fat.

Step 6: Skim excess fat from the cooking liquid, strain it if desired, and reserve the au jus for dipping.

Step 7: Return the shredded beef to the slow cooker with some of the cooking liquid to keep it moist.

Step 8: Preheat the broiler and arrange the split ciabatta rolls cut-side up on a baking sheet, then toast briefly until lightly golden.

Step 9: Spread the Cajun Dijon mayo over the toasted rolls, add the shredded beef, and top with provolone cheese.

Step 10: Return the open-faced sandwiches to the oven just until the cheese melts. Then add the top halves of the rolls and serve immediately with warm au jus!

Tips for the Best French Dip Sandwiches

A few simple tricks will help you create a sandwich that doesn't fall apart before the first dip!

• For the most tender beef, choose a well-marbled chuck roast and give it enough time in the slow cooker to shred easily.
• If the roast still feels tough, let the beef cook longer rather than trying to shred it before it's ready.
• To keep the au jus from getting too salty, use low-sodium beef broth since the French onion soup mix already contains plenty of seasoning.
• Before serving, skim excess fat from the au jus so you get a flavorful dipping sauce without an oily layer on top.
• For sandwiches that hold together, toast the ciabatta rolls before adding the mayo, beef, and cheese.
• When melting the cheese, watch the broiler closely because the rolls can brown quickly.
• If you're serving kids or anyone who prefers milder flavors, offer the Cajun Dijon mayo on the side so everyone can customize their sandwich.

What to Serve with French Dip Sandwiches

These sandwiches are plenty hearty on their own, but adding a simple side makes them an easy, satisfying dinner.

• Roasted potatoes or sweet potato fries are always a good choice for a classic sandwich-and-fries situation.
• A simple green salad with a tangy apple cider vinaigrette balances the rich beef and cheese.
• Roasted green beans or broccoli make an easy vegetable side that doesn't require much attention.
• Coleslaw adds something crunchy and refreshing alongside the warm sandwiches.
• Fresh fruit and raw veggies are an easy, no-cook addition when dinner needs to stay simple.

Making for game day? You can serve the shredded beef directly from the slow cooker and let everyone assemble their own sandwiches!

Storage

If you're lucky enough to have leftover beef, you've already got a head start on another easy meal.

• Refrigerator: Store leftover beef and au jus together in an airtight container in the refrigerator for up to 3 to 4 days to help keep the meat moist.
• Freezer: Freeze the shredded beef with some au jus in a freezer-safe container or bag for up to 3 months for best quality.
• Reheating: On the stovetop, add the beef and some au jus to a covered saucepan over medium-low heat, stirring occasionally until heated through to 165°F. In the microwave, place an individual portion of beef in a microwave-safe dish with a splash of au jus, cover, and heat in short intervals until it reaches 165°F.
• Make Ahead: You can cook the beef 1 to 2 days in advance and refrigerate it with the au jus until you're ready to serve. Reheat the beef, mix up the Cajun Dijon mayo, and assemble the sandwiches just before eating so the rolls stay toasted and the cheese melts perfectly.