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Keto French Dip Sliders

Stacked with tender roast beef, caramelized onions, and melted cheese, these keto french dip sliders come in at 1.2g net carbs and 13g protein each. My homemade au jus tastes like it simmered all day. It didn't.
  • 1.2gnet carbs
  • 13gprotein
  • 60minutes
  • 12servings

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These French dip sliders layer roast beef, provolone and caramelized onions inside a connected sheet of low-carb rolls. Brush the tops with butter, parsley and garlic powder, then bake until the filling is hot and the cheese has melted.

The same skillet that cooked the onions becomes the pan for the au jus. Add the garlic and remaining butter, then the broth, Worcestershire and thyme. Scrape up the browned bits as the broth simmers; they add savory flavor to the dipping sauce.

Start the onions first and prepare the rolls while they cook. Once the sliders go into the oven, make the jus. Serve it in individual bowls for dipping, so the rolls stay dry until each bite. For advance preparation, keep the components separate and assemble just before baking.

A tray of baked keto French dip sliders with golden rolls, melty cheese, and shaved beef tucked inside.

A hand dipping a keto French dip slider into a bowl of rich au jus gravy.

Homemade au jus for dipping

Use the onion skillet for the au jus so the browned bits become part of the sauce. Cook the garlic briefly in the remaining butter, then add beef broth, Worcestershire and chopped thyme. Stir along the bottom to loosen the flavorful bits and simmer for about 10 minutes.

Taste after reducing, before adding more salt: broth and Worcestershire vary in saltiness. Divide the jus into small serving bowls and keep unused sauce separate from used dipping portions.

Storing leftovers (and the real make-ahead move)

For next-day serving, prepare the onions and au jus, cool them promptly in shallow covered containers and refrigerate separately. Keep the rolls, roast beef and cheese separate too. Assemble just before baking; add time if the filling starts cold, and heat the center to 165°F.

Refrigerate leftover sliders and unused jus separately within two hours, or one hour above 90°F, and use within three days. Reheat the sliders to 165°F and bring the jus to a boil. Cover the rolls if they brown before the filling is hot.

For longer storage, freeze the onions and unused jus separately, then thaw in the refrigerator. Roll texture after freezing varies by product, so freezing an assembled tray is not the recommended make-ahead method here.

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The recipe

Keto French Dip Sliders

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Prep 15 min Cook 45 min Total 60 min Serves 12

Ingredients

Servings 12

French Dip Sliders Ingredients

Step by Step Instructions

  1. 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. 

    For this step

    • 2 tablespoons unsalted butter
    • 1 medium yellow onion, thinly sliced
    • 2 thyme sprigs
    Thinly sliced onions are sautéed in a skillet until soft and lightly caramelized for French dip sliders.
  2. 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.

    For this step

    • 12 slider rolls
    A slab of slider rolls is sliced horizontally on a cutting board, ready to be filled.
  3. Assemble sliders

    Top buns with beef, cheese, and caramelized onions. Close with top buns.

    For this step

    • 1 lb thinly sliced deli roast beef
    • 6 slices provolone cheese
    Layers of roast beef, melted cheese, and sautéed onions are assembled on the bottom half of the rolls.
  4. 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. 

    For this step

    • 2 tablespoons unsalted butter
    • 1 teaspoon chopped fresh parsley
    • 1/4 teaspoon garlic powder
    A pastry brush spreads melted butter over the tops of assembled French dip sliders before baking.
  5. Bake the sliders

    Bake at 350°F until the filling is hot and cheese is melted, about 10–15 minutes. Check that the center reaches 165°F; a tray assembled with refrigerated components may take longer. Cover if the tops brown before the filling is hot.

    Baked French dip sliders are topped with chopped herbs and brushed with butter on a baking tray.
  6. 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.

    For this step

    • 1 tablespoon unsalted butter
    • 1 large garlic clove, minced
    • 1 ½ cups beef broth
    • 1 tablespoon Worcestershire sauce
    • 1/2 teaspoon chopped thyme
    Au jus simmers in a skillet, creating a rich dipping sauce for French dip sliders.

Nutrition

Per serving: 1 slider

Calories
178
Fat
12.9g
Protein
13g
Total carbs
12.4g
Net carbs
1.2g

Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.

Frequently Asked Questions

Can I freeze these keto French dip sliders?

For advance preparation, freeze the onions and unused au jus separately and thaw in the refrigerator. Assemble with the rolls, roast beef and cheese just before baking. A frozen assembled tray has not been established as a reliable option for every low-carb roll.

My au jus tastes bland. How do I fix it?

Use the skillet from the onions and scrape the browned bits into the broth. Simmer to concentrate the flavor, then taste before adding salt or more Worcestershire. A low-flavor broth may need a little more reduction, which also concentrates its salt.

Why are my onions soft but not caramelized?

They need time for moisture to cook off and browning to develop. Use a broad skillet, reduce to medium heat after adding the onions and stir occasionally. The card suggests about 30 minutes, but the pan, stove and slice thickness affect the time. Lower the heat if they scorch.

What low-carb slider rolls work best for this?

The card uses a connected 12-count package so you can split the whole sheet horizontally and keep the tray together. Use the package size and nutrition label as your guide; different rolls change both the texture and the nutrition estimate.

How do I lower the carb count?

Check the rolls, onion, broth and Worcestershire labels and amounts first. The card’s 1.2g net carbs per slider is an estimate for the listed recipe. Reducing onion or changing bread changes the flavor and calculation; no single ingredient is guaranteed to be the main carb source for every brand combination.

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Reviews

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4.6 from 34 ratings, 23 written

Made this recipe?

Replying to Kendra

Your rating

Jamie B.

Fantastic! I made these for a work thing and cutting the rolls in one slab meant all twelve came together fast. Still holding up on the tray an hour later! Huge hit!!!

Reply

Annie Lampella

Jamie, the connected rolls are why I make these for a crowd. So happy they held up!

Reply

Jamie B.

Good to know, the slab cutting is what saved me. Doing that again for the next one.

Reply

Vera

Is it ok to use dried thyme instead of the sprigs? That’s all I have on hand, and this is my first time making anything with an au jus.

Reply

Annie Lampella

Vera, dried thyme is fine here. I’d use about 1/4 teaspoon with the onions in place of the two sprigs, and a scant 1/8 teaspoon in the au jus instead of the chopped fresh. Stir it in with the broth so it has a few minutes to soften.

Reply

Vera

Ok, splitting it between the onions and the broth makes sense, I would have just dumped it all in at the end. Letting it sit in the broth a few minutes to soften is the part I wouldn’t have thought of.

Reply

Keisha

Catered a little going-away lunch for a coworker last week and set these out with the au jus on the side. One of the guys kept coming back for more, by his third trip he finally asked what was in the sauce. When I said broth, thyme, garlic, he just stood there like that wasn’t a satisfying answer. Bringing these to the next work thing for sure.

Reply

Renee

I’ve made these four times and started whisking a teaspoon of prepared horseradish into the au jus on batch two. The sharpness cuts through the fat without killing the thyme. Also started spreading a thin layer of whole grain mustard on the bottom bun before the beef goes on. It’s quieter than the horseradish but you notice if it’s gone. Both changes together on batch three, and that’s the version I’ve kept. The base recipe earns four stars. This version earns more.

Reply

Morgan

How do you know when the onions are actually done? Last time I ended up with them half-brown and crispy instead of soft. Really want to get it right before I pile everything on the rolls.

Reply

Kendra

If you’re prepping these ahead, keep the au jus in a jar and don’t assemble until you’re ready to eat. I pack them deconstructed now. Rolls hold up fine and it takes two minutes to put together at lunch.

Reply

Yuki

Solid four stars. Making this twice taught me the roast beef choice matters way more than the ingredient list suggests. I used pre-packaged the first time and it was fine, but went back with sliced-to-order the next weekend. Whole thing changed, more tender, held up way better in the dip. The caramelized onions are genuinely great and I love the butter-brushed top. Just wish I’d known upfront that not all deli beef is the same here.

Reply

Annie Lampella

Yuki, the sliced-to-order is what I use too, and I should probably say so in the post. Pre-packaged breaks down faster in the au jus, you lose the texture that makes the whole thing worth dipping.

Reply

Jessica

Six batches in. The thyme sprigs in the au jus are doing actual work, I pulled them early once to save time and the broth came out noticeably flat, so now they stay in the whole time. I use slightly less beef per roll now so the provolone actually melts through and soaks into the bottom bun instead of just stacking on top. Four stars because I rush the onion caramelization at least half the time and it shows, and that’s a me problem. When I give them the proper time, the sweetness they add to the jus is freaking hard to replicate. Going to try gruyere next time instead of provolone and see if it holds up the same way.

Reply

Rosa

Rubbed a garlic clove on the buns before the butter. Different.

Reply

Annie Lampella

That raw garlic rub hits different than the garlic powder in the butter. The cut side almost scorches it in under the broiler. Good different.

Reply

April

Four keto slider recipes this past year and not one had caramelized onions. Which is apparently the whole point.

Reply

Rita

Tried probably six different keto slider recipes before landing on this one, and nothing else has the au jus depth this gets. The caramelized onion step is the part everyone else skips, and it shows.

Reply

Annie Lampella

The onions are the whole thing. Pull them and you’ve got beef broth with Worcestershire. I’ve tested it. Not even close.

Reply

Stephanie

My dad used to take me to this diner for french dip on Sundays, and that au jus brought me right back to that booth.

Reply

Annie Lampella

Sunday diner trips are hard to recreate. Glad the au jus got you back there.

Reply

Luis Moore

The au jus on this is freaking insane, sixth time making it and I’m still dunking the buns until they’re basically falling apart.

Reply

Annie Lampella

Sixth time and the buns still can’t survive it. The Worcestershire and the skillet deglaze make that broth too good to stop at one dip.

Reply

Riley

Brown the butter before brushing it on the buns. I got distracted and left it on the stove a beat too long — the tops came out with this nutty depth I’d been missing in every slider I’ve made. Also swapped provolone for havarti because it’s what I had, and it melted into the roast beef layers so completely you couldn’t tell where the cheese ended and the beef started. Both going in my notes for next time.

Reply

Annie Lampella

Browned butter on the buns, I’m stealing that. Makes sense with the au jus. And havarti melts cleaner than provolone anyway, good swap.

Reply

Holly

Used a wire rack under the sliders so the bottom buns don’t steam out, and swapped provolone for havarti since I had it, got a cleaner melt with no oily pooling.

Reply

Annie Lampella

Havarti melts so much cleaner than provolone, less oil separation. I need to try the wire rack – the steam issue is real, especially with a full sheet of sliders.

Reply

Natalie

Made these on Sunday and my husband, who eats whatever I put in front of him but never actually says anything, grabbed a second one and went back to the au jus for more dipping before I even finished plating. That was the whole review right there. The caramelized onions took longer than I expected, but they’re worth every minute. I’d budget an extra 10 minutes for them next time so I’m not watching the clock while everything else sits.

Reply

Annie Lampella

The au jus grab before you finished plating, that’s the real review. Onion timing trips people up on this one. I start them first and get everything else ready while they go, no scramble at the end.

Reply

Aisha L.

Never made sliders before and the caramelized onions had my kitchen smelling incredible halfway through. Quick question though, does the au jus hold up if you make it the night before?

Reply

Annie Lampella

Yeah, au jus is actually better the next day. Honestly the flavor deepens overnight. Just warm it over low heat and stir once or twice, it loosens right up.

Reply

Matt

My son has been skeptical of everything I make since I went keto. But he dunked his slider into the au jus, looked up at me, and said ‘wait, this is actually good’ like it personally offended him that it wasn’t terrible. Made the caramelized onions exactly as written, low and slow, and they came out so sweet and soft he kept stealing them off the cutting board. Going to double the onions next time. Basically none were left by the time I assembled.

Reply

Annie Lampella

That ‘it personally offended him’ made me laugh. And yes, double the onions. I already make a bigger batch than the recipe calls for because they disappear before assembly.

Reply

Aaliyah

I fully expected the low-carb rolls to ruin it and instead I’ve already made these twice this week.

Reply

Annie Lampella

Twice in one week is the real review. The rolls gave me the most trouble in testing, brand matters more than you’d think.

Reply

Beth

Added a splash of Worcestershire to the au jus and it tastes like you spent all Sunday on it.

Reply

Annie Lampella

It’s already in there and I still add a little extra too. Something about that second splash makes it taste like the broth had more time.

Reply

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