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French dip sliders with ajus

Gal Pal French Dip Sliders (with Caramelized Onions + Au Jus)

These sliders are the best French dip sandwich you have ever had! Juicy roast beef, buttery caramelized onions, melty provolone in a mini size! This is the perfect item to serve for your next family gathering or football party.
French dip sliders are best served hot and melty, straight from the oven, with a side of warm au jus for dipping. I like to pour the au jus into small mugs, ramekins, or even espresso cups so everyone gets their own little dunking station (because sharing dipping sauce at a party is… a lot). Keep the au jus warm on the stovetop or in a small slow cooker so it’s ready whenever sliders are grabbed.
Arrange the sliders on a large platter or cutting board, then scatter a few napkins nearby—these are deliciously juicy and not exactly a one-hand snack. For game day or casual entertaining, set the sliders next to the au jus with a simple label or chalkboard sign so guests know exactly what to do. Trust me, once people realize there’s dipping involved, these disappear fast.
If you want to make it feel extra cozy, serve the sliders in batches and refresh the platter as the game goes on—warm sandwiches + hot au jus is the move every time.
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Total Time 45 minutes
Servings: 12 Sliders
Ingredients Method Notes

Ingredients
  

  • 12 slider buns Hawaiian rolls for pillow-soft sweetness
  • 1 lb thinly sliced roast beef deli style or leftover steak works!
  • 12 slices provolone cheese melted over the beef
  • 1 large yellow onion thinly sliced
  • 5 Tbsp unsalted butter divided
  • 2 sprigs fresh thyme + ½ tsp chopped thyme
  • 1 tsp fresh parsley plus extra for garnish
  • 1 clove garlic finely chopped
  • 1½ cups low-sodium beef broth
  • 1 Tbsp Worcestershire sauce
  • ¼ tsp garlic powder
  • Kosher salt + black pepper to taste 🍖🍞
  • Optional cozy add-ins: a drizzle of horseradish sauce on the buns, sprinkle of flaky sea salt on top, or a slice of caramelized shallot

Method
 

  1. Caramelize those onions (patience = flavor!)Heat 2 Tbsp butter in a skillet over medium-high. Add the onion, thyme sprigs, salt + pepper, and cook, stirring sometimes, until golden, meltingly soft and sweet — about 30–40 minutes. Don’t rush this — it’s the flavor bomb in the sliders. Discard the thyme stems when done.
  2. Build the sliders:Set the bottom halves of your buns on a baking sheet. Layer on the roast beef, add a slice (or two — no judgment) of provolone, and pile on those caramelized onions you worked so hard on. Finish by placing the tops on the buns and get them ready for the oven.
  3. Butter + season the tops:Microwave 2 Tbsp butter until melted, brush it over the top buns, then sprinkle with parsley, garlic powder, and a pinch of salt. It’s like garlic-butter comfort in every bite.
  4. Bake until toasty : Slide into a 350°F oven for about 10–15 minutes — just until the cheese is dreamy and the sliders are warmed through.
  5. Make the au jus (aka the non-negotiable part).Using the same pan you caramelized the onions in — because flavor matters — melt the last bit of butter and sauté the garlic just until it smells amazing (about a minute). Pour in the beef broth, add the Worcestershire and chopped thyme, then season with salt and pepper. Let it gently simmer for about 10 minutes so it reduces slightly and turns rich, cozy, and totally dunk-worthy.
  6. Serve & dunk!Pile the sliders on a platter, garnish with fresh parsley, and pass the au jus on the side for dipping.Tip: Serve with roasted potatoes, sweet potato chips, or a crunchy slaw for a full spread.

Notes

French dip sliders are one of those recipes that check all the boxes—comfort food, crowd-pleaser, and easy enough to pull together without stress.
They have all the cozy flavor of a classic French dip sandwich but in a fun, shareable form that works just as well for game day as it does for casual entertaining or a family dinner.
The key is taking a little extra time with the caramelized onions, letting them cook low and slow until they’re golden and sweet, because that’s where so much of the flavor lives. Thin-sliced roast beef keeps the sliders tender and easy to eat, while provolone adds that melty, classic finish everyone expects.
Brushing the tops with buttery garlic goodness gives them a warm, bakery-style touch that makes the whole pan feel extra special. And the au jus isn’t optional—it’s what turns these from good to unforgettable, especially when you make it in the same pan as the onions for maximum flavor and minimal cleanup.
These sliders come together quickly, can be assembled ahead of time, and are best served straight from the oven when the cheese is melted and the buns are perfectly warm. They’re ideal alongside chips, roasted potatoes, or a simple salad, and if there are leftovers (which is rare), they reheat beautifully.