I’ve made these French Dip Sliders more times than I can count for game nights and quick weeknight dinners. They’re a tiny, hands-on version of the classic sandwich: soft slider buns stuffed with thinly sliced roast beef, sweet caramelized onions, melting Swiss, and a steaming cup of au jus for dunking. They come together fast, feed a crowd, and taste like you spent an afternoon fussing in the kitchen. I often pair them with a warm, cheesy casserole like creamy French onion beef casserole when I want hearty comfort food on the table.
Why you’ll love this dish
These sliders hit several marks at once: they’re comforting but not fussy, portable enough for parties, and wallet-friendly when you use leftover roast beef or deli slices. The caramelized onions add a sweet-savory depth that contrasts perfectly with the bright, salty au jus. Make them for a casual dinner, a brunch spread, or a game-day platter — they please kids and adults alike.
“Little bites with big flavor — these sliders disappeared before I could grab a second one. Perfect for a crowd and so easy to assemble.” — a regular at my dinner table
Step-by-step overview
Start by caramelizing onions low and slow until they’re a deep golden brown. Hollow out a tray of slider buns, layer with roast beef and onions, cover with Swiss, brush with butter, then bake until the cheese melts and tops turn golden. Warm the au jus and serve the sliders hot so everyone can dip and enjoy. The entire hands-on time is minimal if you use pre-sliced beef.
Gather these items
- Slider buns or small dinner rolls (about 12)
- Thinly sliced roast beef (deli-style or leftover roast)
- 2 large onions, thinly sliced
- Swiss cheese slices, torn or cut to fit sliders (or another melty cheese)
- Au jus for dipping (store-bought or homemade beef broth-based au jus)
- Salt to taste
- Freshly ground black pepper to taste
- Unsalted butter, melted for brushing tops
Notes: Swap rolls for king’s Hawaiian if you like a sweeter top. If you’re short on time, pre-sliced caramelized onions from the store work in a pinch.
Directions to follow
- Preheat the oven to 350°F (175°C).
- Heat a skillet over medium. Add a splash of oil or a little butter and the sliced onions. Cook, stirring now and then, until the onions are deeply golden and sweet, about 20 to 25 minutes. Season lightly with salt toward the end.
- Slice the slider buns horizontally and place the bottom halves in a baking dish, close together.
- Layer the roast beef across the bottom halves in an even layer. Pile the caramelized onions on top of the beef.
- Lay torn or trimmed Swiss cheese over the onions and meat, covering the sliders. Place the top halves of the buns back on.
- Brush the tops with melted butter and sprinkle with a little salt and freshly ground pepper.
- Bake for 12 to 15 minutes, until the cheese has melted and the buns are golden. If you want crisper, browned tops, broil for a few seconds while watching closely.
- Warm the au jus on the stove or microwave. Serve the sliders hot with small bowls of au jus for dipping.
Best ways to enjoy it
Serve these sliders straight from the oven with individual dipping bowls of au jus. They pair well with crisp pickles, a green salad tossed in a bright vinaigrette, or oven fries. For a brunch or buffet spread, place a stack of sliders on a platter and label the dipping sauce so guests know what to expect. If you’re planning a sweet-salty menu, serve alongside something like an overnight blueberry French toast casserole to round out the table.
Storage and reheating tips
Refrigerate leftovers in an airtight container within two hours of cooking. Sliders keep well for 3 to 4 days in the fridge. To reheat, bake at 350°F (175°C) for 8 to 10 minutes covered with foil until warmed through, or microwave individual servings until hot, then crisp the tops in a toaster oven if desired. To freeze, wrap cooled assembled sliders tightly in foil and place in a freezer bag for up to 2 months. Thaw overnight in the fridge before reheating. Always reheat to an internal temperature of 165°F for safety.
Helpful cooking tips
- Caramelize onions slowly. Low heat and patience bring out the best sweet, jammy flavor.
- Warm the au jus gently; boiling can concentrate and change the flavor.
- If your roast beef is thick, slice it thinner so the sliders stay tender and easy to bite.
- Brush the tops with butter right before baking for a glossy, flavorful crust.
- To avoid soggy bottoms, don’t pile wet onions directly onto very soft buns; use a light layer and drain excess juices.
Creative twists
- Add a smear of horseradish cream under the cheese for a brisk bite.
- Swap Swiss for provolone or fontina for a milder, creamier melt.
- Stir sautéed mushrooms into the onions for an earthy mushroom-Swiss slider.
- Make mini open-faced versions under the broiler for a quick, crisp-topped appetizer.
- For a lighter option, use whole grain slider rolls and thinly layer lean roast beef with extra greens.
Common questions
Can I use deli roast beef instead of leftover roast?
Yes. Thinly sliced deli roast beef works perfectly and saves time. If your slices are cold from the fridge, let them come closer to room temperature or warm briefly in the au jus before assembling so they heat through evenly in the oven.
How long does it take to caramelize onions?
Expect 20 to 25 minutes over medium heat with regular stirring. If your heat is too high they’ll brown too fast and can burn; too low and they’ll take much longer. Aim for a deep golden color and sweet aroma.
Can I make these ahead for a party?
You can assemble the sliders up to a day in advance and keep them covered in the fridge. Brush with butter and bake about 15 to 20 minutes before serving so they’re hot and the cheese is perfect. If frozen, thaw overnight before reheating.
What can I use for au jus if I don’t have a mix?
Use low-sodium beef broth warmed with a splash of Worcestershire sauce and a pinch of onion powder. Simmer briefly and taste for seasoning. If you have pan drippings from cooked roast, add those for extra depth.
Are these safe to freeze after baking?
Yes. Baked sliders freeze well if wrapped tightly. Reheat from frozen by covering with foil and baking at 350°F until heated through, about 20 to 30 minutes depending on size.
French Dip Sliders
Ingredients
Method
- Preheat the oven to 350°F (175°C).
- Heat a skillet over medium. Add a splash of oil or a little butter and the sliced onions. Cook, stirring now and then, until the onions are deeply golden and sweet, about 20 to 25 minutes. Season lightly with salt toward the end.
- Slice the slider buns horizontally and place the bottom halves in a baking dish, close together.
- Layer the roast beef across the bottom halves in an even layer. Pile the caramelized onions on top of the beef.
- Lay torn or trimmed Swiss cheese over the onions and meat, covering the sliders. Place the top halves of the buns back on.
- Brush the tops with melted butter and sprinkle with a little salt and freshly ground pepper.
- Bake for 12 to 15 minutes, until the cheese has melted and the buns are golden. For crisper tops, broil for a few seconds while watching closely.
- Warm the au jus on the stove or microwave. Serve the sliders hot with small bowls of au jus for dipping.
