Stuffed French Onion Soup Sliders


Stuffed French Onion Soup Sliders are stuffed with cheese then topped with a luscious french onion topping!

Fire up the grill for a hand-held, soup-inspired, fantastic grilled supper:  Stuffed French Onion Soup Sliders!

Think savory French Onion Soup – beefy broth, sweet caramelized onions, melted cheese, and toasted bread – in slider form. I want to pinch their baby burger cheeks!


I don’t know how or why I came to crave these stuffed burgers (gosh I’m interesting) but I do know that we’re on day 2 of “sticky floor”, aka hot & humid, weather around here, and nothing sounds better than a quick dinner made primarily on the grill. These are soooooo good, and really easy too!


Start the sliders by caramelizing a couple jumbo sweet onions, which are arguably the star of both French Onion Soup AND these sliders. Just peel the onions, cut them in half, then thinly slice each half.


Next, melt 1 Tablespoon each butter and extra virgin olive oil in a large skillet over medium heat. Like a 5 out of 10. You want these babies to cook looow and slooow.


Add the onions, toss to coat in the butter and oil, then let them cook, stirring every so often, for 20-30 minutes.

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Slowly the onions start to transform and sweeten up.

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The natural sugars in the onion will caramelize, and soon you’ll have a skillet full of what I fondly refer to as, onion candy.

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Seriously, you won’t believe how sweet these suckers get!


Mmkay. While the onions are caramelizing, get to work on the slider portion of the program. You’ll need 1lb lean ground beef (I used 90/10) and 2 Tablespoons Onion Soup & Dip Mix (that’s half of 1 packet.)

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The flavor from the beef mimics the savory broth of French Onion Soup, while the onion soup & dip mix contains a perfect blend of yummy, soup spices.


Add in 1/4 cup water, then mix it all up with your hands.

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Form the mixture into 8, equal sized balls. I usually divide the beef into quarters in the bowl, then divide each quarter in half to make sure everyone comes out the same size.


Next, turn your attention to da cheese. Fontina! My favorite cheese, due to its mild taste, creamy texture, and tremendous melting abilities.


Fontina is typically sliced then broiled over bowls of French Onion Soup, but today we’re gonna use it to stuff inside the sliders.


Cut the cheese into 8 cubes, then press your thumb into the middle of each beef ball and stuff a cube inside. Seal the beef tightly around the cheese so it doesn’t leak out while the sliders are grilling. Press the balls into patties, then head out to the grill.

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Preheat the grill to medium-high heat, then grill the sliders for 5-6 minutes a side. Do not grill over high heat, as the cheese will burst out of the sliders and onto the grates. Wasted melted cheese is a terrible thing.


During the last minute or so, pop the slider rolls onto the grill to toast up. It’s my nod to French Onion Soup’s toasted bread hunk floating under the cheese and amongst the beefy broth. I used tea rolls, but any small bun will do.


When the sliders are cooked through, remove them to a plate, cover with foil, and let them rest for at least 5 minutes.


Place the rested sliders onto the toasted buns, top with caramelized onions, and dig in!


Stuffed French Onion Soup Sliders

Makes 8 sliders


Stuffed French Onion Soup Sliders are stuffed with cheese then topped with a luscious french onion topping!


  • 2 jumbo sweet onions, cut in half, then sliced thin
  • 1 Tablespoon butter
  • 1 Tablespoon extra virgin olive oil
  • 2oz fontina cheese
  • 1lb lean ground beef
  • 2 Tablespoons (1/2 packet) Onion Soup & Dip Mix
  • 1/4 cup water
  • 8 tea or cocktail rolls, or any small bun


  1. Melt butter and olive oil in a large skillet over medium heat (5 out of 10.) Add onions and toss to coat. Cook for 25-30 minutes, stirring occasionally, until onions are soft and golden brown. Turn heat down during the cooking process if onions begin to burn.
  2. Meanwhile, cut fontina cheese into 8 cubes. In a large bowl, combine ground beef with onion soup & dip mix and water, then form into 8 balls. Push your thumb into the balls to create an indentation, then stuff with a cheese cube. Seal tightly, then flatten slightly into a patty. Repeat with remaining cheese and ground beef.
  3. Heat grill to medium-high, then grill sliders for 5-6 minutes a side. Remove to a plate, cover with foil, then let rest for 5 minutes. Toast buns briefly on the grill, then top sliders with caramelized onions and serve.

This recipe is courtesy of Iowa Girl Eats,


You could literally put caramelized onions on anything, and I would gobble it up. They are sticky-sweet, and insanely delish.


The molten flow of fontina stuffed in the center comes in a close second though, and I just love how the onion soup & dip mix makes these sliders taste just like their soupy sister.




Have a good one!

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  1. Monica 05.02.2012

    Ohmygoodness these look AMAZING! Will have to make them soon. Thanks!

  2. OMG, I totally made these (sans stuffage) back in December… great reminder!

  3. erica 05.02.2012

    there is a pool of drool on my desk right now. that looks amazing! i love french onion soup. and burgers.

  4. Dee 05.02.2012

    Food Porn.

  5. Megan 05.02.2012

    Oh my gosh, this looks incredible! Definitely bookmarking for a future use. :)

  6. katie 05.02.2012

    Yum!!! Always look forward to your evening posts. Now i know what im makin for supper!

  7. Kris 05.02.2012

    You are killin me! These look amazing. I am a HUGE FOS (French onion soup) fan. Thanks!!!

  8. karenc 05.02.2012

    I love fontina cheese so I will be anxious to make these! I just want you to know how much I enjoy your blog – it is my favorite – and I am not biased because I am from Iowa either! :-) Your recipes, photos and interesting writings are fantastic!

  9. What an amazing idea! I love french onion soup, and these are so cute in slider form :-)

  10. I love all your stuffed burger recipes, this one sounds really delicious!!

  11. Annie 05.02.2012

    This looks very similar to what Rachel Ray did on her show this month.

  12. These look heavenly. My boyfriend will DIE when he sees these. Looks like they’ll be making their way on our dinner menu soon!

  13. Kelly 05.02.2012

    Juicy Lucy Reinvented

  14. Michelle L. 05.02.2012

    What a great idea! And I am a big fan of cheese on the inside of burgers :) Pics look great !

  15. Melissa 05.02.2012

    Is it me or do the look a bit undercooked (pink) inside? Must be an American thing…

    I’ve always wanted to eat french onion soup but hate onions…all that melted cheese looks heavenly!

    • Emily 05.03.2012

      I agree, my husband would want them to be cooked till brown all the way through. I know that’s hard to do with stuffed burgers but that’s how we eat them (just sayin)

      Thanks for Saying something Melissa!

    • Iowa Girl Eats 05.03.2012

      It’s definitely cooked through!

  16. OMG! You have just made my husband’s week with this recipe! Thanks :)

  17. Jamie 05.02.2012

    What if I put caramelized onions on….COOKED CARROTS, hm?? Heehee =]

    • Iowa Girl Eats 05.03.2012

      I did have to think about this for a good 4 minutes…the answer is….YES! I would try, anyways! Excuse me while I go gag at the thought though. ;)

      • Jamie 05.03.2012

        Oh, the things we do for food. But ESPECIALLY for caramelized onions!

  18. My mouth is totally watering right now, no joke!

  19. CJ - Food Stories 05.03.2012

    Great easy summertime recipe. Love the cheesey surprise in the middle.

  20. These are so good I think I almost cried a bit..

  21. Elyse 05.03.2012

    Yum! I can’t wait until we start up our grill again, as these babies are now the FIRST thing I want to make!! Thank you!

  22. Angel 05.03.2012

    Looks great…I’m not sure if you care about MSG but I just discovered that Lipton’s Onion Soup/Dip Mix has MSG in it. I was using it for a meatloaf and decided to look at the ingredients. So beware if you want to avoid MSG :)

  23. I looove caramelized onions but I don’t love french onion soup. But I love french onion mix, like in a dip. Weird? Either way, I definitely think I would love these burgers.

  24. These look amaaaaazing. I need to run out and buy fontina cheese and soup mix asap so I can make these!

  25. Those look FANTASTIC!! Yummy!

  26. Carrie 05.03.2012

    French Onion Soup is one thing I truly do miss since becoming vegan, and I don’t think there’s any way to veganize it without being like, What the HELL is this crap!?

  27. Laura 05.03.2012

    omg, omg, omg. o.m.g.
    These look SO good!

  28. These look unreal! Cannot wait to make these!

  29. I don’t even know what to say about this. I mean you’ve really outdone yourself here!

  30. […] 3. Try a new beef dish. Break out of the suppertime rut with creative, easy beef recipes. A few new favorites: – Steakhouse pizza, – Steak carne asada tacos, – French onion soup sliders, […]

  31. […] so, of course, I’m totally drooling over these Stuffed French Onion Soup Sliders from Iowa Girl […]

  32. Danell 05.04.2012

    I made non-mini versions of these babies last night. Delicious and so easy! Thank you for sharing :)

  33. Julie 05.04.2012

    These were AWESOME!

  34. Kellie 05.05.2012

    We made these tonight on this perfect Kansas evening! Delish! We’ll definitely be having them again! Great recipe!

  35. […] Stuffed French Onion Soup Cheddar Cheese Sliders  (Recipe adapted from here) […]

  36. Gwen 05.09.2012

    These look yum! I have put onion soup mix in burgers before and I have stuffed burgers with cheese, but never the two at the same time. Brilliant idea!

  37. Wendy 05.09.2012

    Can you make the caremelized onions the day before you make the burgers? I have a tight dinner timeframe tomorrow, so if I can do that part today, it will make life easier.

  38. Liesl Johnson 05.09.2012

    Made these for dinner and OH MY! These are SO YUMMMMMMY! The caramelized onions are like candy and are such a nice balance to the savory oniony flavor in the beef. I want to make a normal size burger of this next time…oh yes…there WILL be a next time! Kristin, once again, you’ve knocked it out of the park.

  39. Wendy 05.10.2012

    I wish I would have carmelized 6 onions last night, so I could put them on everything I eat for the next two errr 1 days. My husband and I give these 4 thumbs up.

  40. Food | Pearltrees 05.15.2012

    […] to baseball, and mowed, and trimmed, and baked, and ….well I never did get to that laundry. Stuffed French Onion Soup Sliders Think savory French Onion Soup – beefy broth, sweet caramelized onions, melted cheese, and […]

  41. Meredith 07.23.2012

    These were amazing. I made them last night (it was my first attempt of grilling). My husband said they were one of the best burgers that he ever had! Thanks for the recipe! This one is a keeper!

  42. […] Stuffed French Onion Dip Sliders by Iowa Girl Eats […]

  43. […] hot out there!  So, after searching online (thanks once again goes to Pinterest!), I found this burger recipe that I knew I just *had* to try!  It’s a French onion burger *stuffed* with […]

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