Keto French Dip Sliders
Published January 26, 2026 • Updated March 13, 2026
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French dip sandwiches were never meant to be dainty. They’re messy, drippy, beefy, and require at least three napkins… which is exactly why I missed them so much after going low carb. A bunless pile of roast beef just wasn’t cutting it. I wanted the full experience, something I could pick up, dunk, and inevitably drip down my wrist.
So these sliders happened.
They’re stacked with warm roast beef, deeply caramelized onions, melted cheese, and tucked into soft keto slider rolls. But the real star is the au jus. It’s homemade, takes about 10 minutes, and somehow tastes like it simmered all day. I deglaze the skillet after pulling the caramelized onions and all that fond dissolves right in. That’s basically concentrated flavor at that point. These sliders are meant to be dipped. No dry sandwiches allowed.
I’ve made these for weeknight dinners, casual get-togethers, and game nights where everyone “just wants one”… and then somehow four disappear. They’re the kind of thing I set out on a board next to Italian keto sliders or a pile of keto nachos and let people graze. For something lighter alongside, buffalo cauliflower balances out all that beef and cheese.
A few things I’ve learned after making these more times than I can count. Provolone is my default, but Swiss gives a sharper bite that pairs better with the au jus. I go back and forth depending on what’s in the fridge. One reader tried Gruyere and I need to test that next because the nuttiness against roast beef sounds incredible. And if you have leftover pot roast, shred it and use that instead of deli slices. The texture is different (more pulled, less layered) but the flavor gets even deeper once it soaks in the jus.
The buns hold up even when you dunk them. They get this golden, slightly toasted crust from the garlic butter on top that resists the au jus just long enough. I’ve had readers tell me they’ve made these five or six times and the buns work every single time. That was the part I was most nervous about when developing this recipe, and it’s the part I’m most proud of now. If you want another slider recipe to rotate in, my keto chicken parmesan sliders are the other one I keep coming back to.
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Ingredients
5 tablespoons unsalted butter, divided -
1 medium yellow onion, thinly sliced
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2 thyme sprigs, plus 1/2 teaspoon chopped thyme
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salt & pepper for seasoning
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1 package (12-count) low-carb slider rolls
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1 pound thinly sliced deli roast beef
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6 slices provolone cheese
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1 teaspoon chopped fresh parsley, plus more for serving
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1/4 teaspoon garlic powder
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1 large garlic clove, minced
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1 ½ cups beef broth
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1 tablespoon Worcestershire sauce
Step by Step Instructions
Step by Step Instructions
Caramelize the onion
Arrange a rack in the center of the oven and preheat to 350 degrees F. In a large skillet over medium high heat, melt 2 tablespoons butter. Add onion and thyme sprigs. Season with salt and pepper. Reduce heat to medium and cook, stirring occasionally, until onion is caramelized, about 30 minutes. Discard thyme.
- 2 tablespoons unsalted butter
- 1 medium yellow onion, thinly sliced
- 2 thyme sprigs
Cut the rolls
Place still-attached rolls on a cutting board. Cut buns in half parallel to the cutting board, keeping them attached. Place bottom buns on a parchment lined baking sheet or casserole dish, cut side up.
- 12 slider rolls
Assemble sliders
Top buns with beef, cheese, and caramelized onions. Close with top buns.
- 1 lb thinly sliced deli roast beef
- 6 slices provolone cheese
Buttery goodness
In a small bowl, microwave 2 tablespoons butter until melted. Brush on bun tops. Sprinkle with parsley and garlic powder. Season with salt.
- 2 tablespoons unsalted butter
- 1 teaspoon chopped fresh parsley
- 1/4 teaspoon garlic powder
Make Au jus
Meanwhile, in the same skillet over medium heat, melt remaining tablespoon of butter. Add minced garlic and cook until fragrant, 1 minute. Add broth, Worcestershire and chopped thyme. Season with salt and pepper. Bring to a simmer and cook until slightly reduced, 10 minutes. Sprinkle fresh parsley on buns and serve with au jus.
- 1 tablespoon unsalted butter
- 1 large garlic clove, minced
- 1 ½ cups beef broth
- 1 tablespoon Worcestershire sauce
- 1/2 teaspoon chopped thyme
Nutrition disclaimer
The nutrition information provided is an estimate and is for informational purposes only. I am a Doctor of Pharmacy (Pharm.D.); however, this content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified health provider before making any lifestyle changes or beginning a new nutrition program.
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Get My Macros + Recipes →Frequently Asked Questions
Can I freeze these keto french dip sliders?
I've frozen assembled (unbaked) sliders wrapped tightly in foil and they held up for about 6 weeks. Thaw in the fridge overnight, then bake as directed. The au jus freezes separately in a mason jar. I wouldn't go past 2 months on either because the rolls start losing texture, but for batch cooking this works.
Can I use leftover pot roast instead of deli roast beef?
I've done this and it works well. Shred the pot roast and pile it on the same way. The texture is different (more pulled, less layered) but the flavor actually gets deeper once it soaks up the au jus. I warm the meat in a little of the jus before assembling so it doesn't cool down the sliders.
What cheese works best besides provolone?
Swiss is my most frequent swap. It gives a sharper bite that cuts through the richness of the au jus, and it melts a bit cleaner than provolone. A reader tried Gruyere and loved the nuttiness against the roast beef, which is next on my list to test. Mozzarella works if that's what you have, but it's milder so you lose some of that contrast I like.
My au jus tastes bland. How do I fix it?
I've had this happen when using a weak beef broth. Let it simmer a few extra minutes to reduce and concentrate, and add another splash of Worcestershire. The thing that made the biggest difference for me was deglazing the skillet after pulling the caramelized onions. All that fond on the bottom dissolves right in and adds depth you can't get any other way. I do this every time now.
My onions aren't caramelizing, they're just soft.
This happened to me early on when I was rushing. The heat was too high and the pan was too crowded. I cook mine over medium-low heat, give them space in the skillet, and stir occasionally instead of constantly. It takes a full 30 minutes and you need to let the moisture cook off so they actually brown instead of steam. The patience pays off.
What low-carb slider rolls work best for this?
I use store-bought low-carb slider rolls, the kind that come in a connected 12-pack. They work best because you can cut them all at once and bake as a pull-apart tray. If you can't find slider-sized rolls, I've cut regular low-carb hamburger buns into halves and it works fine, you just get fewer sliders per batch. Some people use chaffles as the base, which I haven't tried for this specific recipe. My concern would be the dipping making them fall apart.
How do I lower the carb count?
The onions are where most of my carbs come from in this recipe. I've cut back to half an onion and it still tasted great, just less of that sweet caramelized layer. You could skip them entirely if you're strict, but I'd keep at least a thin layer because they add most of the flavor alongside the au jus.
I'm on my fifth or sixth time making these and I still can't figure out why I was so late to the party on caramelized onions because they completely change everything here. The sweetness against the roast beef and that provolone (which I may have doubled, no regrets) hits so differently than a regular dip sandwich. The au jus is the part I keep coming back for, I make a little extra now because I end up drinking the rest like some kind of feral person who forgot she's an adult. The buns stay crispy on top even when you dunk them, which felt like it shouldn't work but it does every time. Made these for Sunday dinner last week and had to physically stop myself from eating a third one, but also the macros are so reasonable I probably could have. Making another batch Thursday.
The au jus thing is not just you. I make extra every time because it disappears before the sliders do. Double provolone was the right call.
Third time making these and I finally figured out the onions need the full caramelization time, not a quick saute. The au jus is completely different once they're properly sweet and soft. Worth every extra minute.
Added a spoonful of horseradish to the au jus and it completely changed the dipping experience, sharper and more complex without being overwhelming. Also started brushing the bottom buns with butter before assembling (not just the tops) and they get this toasted, almost crackly crunch that I couldn't figure out where it was coming from the first time I made these. The caramelized onions take patience but they're what makes this, don't rush them.
Third time making these and I finally switched to Swiss instead of provolone. Way better melt and it works with the au jus. Caramelized onions still steal the show.
Third time and the caramelized onions are still the star. Yeah, Swiss melts cleaner and handles the au jus better than provolone does. Good call.
First time making anything slider-ish since going keto and I kept second-guessing the caramelized onions, but that sweetness against the roast beef was exactly what it needed. Can these be assembled ahead and baked the next morning, or will the rolls get soggy overnight?
Assembled overnight the rolls get soggy, yeah. What I do is caramelize the onions and make the au jus the night before, then assemble and bake fresh in the morning. The onions take the longest anyway so it saves the bulk of the work.
Deglazed the pan with a splash of beef broth after pulling the caramelized onions and it completely changed that dipping sauce. All that fond dissolved right in and it tasted like it had been simmering for hours. Also swapped the provolone for gruyere (had a wedge in the fridge) and the nuttiness against the roast beef is something else. These are in the rotation now.
Deglazing after the onions, yes. That fond is basically concentrated au jus at that point. Gruyere I haven't tried on this one but now I need to.
used swiss instead of provolone, worked fine
Swiss gets a little sharper when it melts which I actually like with the au jus. Good swap.
Second time making these. Used swiss instead of provolone, both work.
Love that you tried both. I actually go back and forth between provolone and swiss depending on what's in the fridge. Swiss gives it a slightly sharper bite that works really well with the au jus.
Caramelizing the onions took closer to 40 minutes for me but they were worth the wait. Really good with the au jus.
Amy it really depends on the stove and how thin the slices are. Low and slow is the way to go with those onions, worth every minute.
The au jus is what makes these. So good for dipping.
Right? The Worcestershire and reduced broth do most of the work. I keep extra in a little bowl.