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French Onion Mac and Cheese

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Today’s French Onion Mac and Cheese recipe has got your name written ALL over it, and I’m happily handing it to you! You’re welcome! 🙂

Vertical image of baked mac and cheese in a casserole dish with onions in the foreground and canisters in the background.

Ever wish you could make a mac and cheese recipe that you’d become famous for? You know, the one your friends and family would consider your signature dish? Look no further.

**Please Note – The printable recipe card with detailed instructions, complete ingredient measurements, and nutritional information for making French Onion Macaroni and Cheese is available at the end of this post. OR you can hit the “jump to recipe” button (found above) to be taken directly to the recipe. 


Title text vertical collage of French onion Mac and cheese

The ingredient list:

**Note – The following lists of ingredients plus kitchen tools and equipment contain affiliate links (highlighted in blue) for your consideration and shopping convenience.#CommissionsEarned

Kitchen tools and equipment needed:

How this recipe came to be:

This delicious pasta dish is a mashup of a recipe I’ve been making for years and years called Lovin’ Onions, and a traditional baked macaroni and cheese recipe using a basic roux as the base, and then adding lots and lots of cheese!

If you love sweet caramelized onions and creamy macaroni and cheese, then you’re going to absolutely flip your lid for this baked French onion mac and cheese casserole! You have my word on it!!

Click to Check out my latest and greatest Kudos Kitchen tasty BBQ side dishes recipe roundup.

What is the key to making perfect caramelized onions and how long does it take?

  • The longer you cook the onions, the sweeter and the deeper golden brown color they become.
  • To start the onions the heat under the pan should be medium-high. Once the onions have started to brown, reduce the heat to medium and continue caramelizing until your desired doneness.
  • Don’t season the onions right away. Wait until they start to get some color (about 5 minutes) before seasoning. Adding salt at the beginning of caramelizing will bring out the water in the onions and they won’t get off to a good start.
  • Don’t stir often. Let the pan do the work and leave the onions cook, unattended, for periods of 7-10 minutes without stirring.
  • From start to finish, for deeply caramelized onions, the process should take roughly 30 minutes.

Additional pasta shape suggestions:

You can use whatever pasta shape you love the most. A standard elbow shape is probably the most popular for a macaroni and cheese recipe, but why not switch things up a little by using a rotini (corkscrew), farfalle, fusilli, orecchiette, cavatelli, or cavatappi?

Just as long as you choose a pasta shape that will trap and carry all that wonderful cheesy caramelized onion sauce into your mouth, you’ll be all set!

To learn more about fun and unique pasta shapes including all the nutritional information you need, check out the site Pasta Fits.

Can gluten-free pasta be used in this recipe?

Sure thing! It’s totally your call what type of pasta you choose to use in this recipe. 

Cook your chosen pasta according to the package directions, and carry on with the written recipe from there.

Vertical photo collage of a casserole dish loaded with macaroni and cheese with caramelized onions.

Can this macaroni and cheese recipe be made in advance?

Yes, yes, and yes!! 

As with all pasta dishes (at least I haven’t heard of any that don’t comply with this rule), they only get better after they’ve had a chance to sit for a day or two.

Cover the casserole dish well (cool it fully, first) and you can refrigerate this for up to 2 days before reheating and serving.

Leftovers can be stored in airtight containers for up to 5 days, but it’s highly doubtful that they’ll last that long!

Vertical title text image of a closeup photo of French onion mac and cheese on a serving spoon.

Can this baked French onion mac and cheese be frozen?

Heck yeah!!!

Might I suggest (if you’re not feeding a crowd), that you divide this casserole in half and freeze some for another time?

Or, why not double the recipe, to begin with, eat one casserole now, and freeze one for later!

This is a great dish to bring to a pot-luck, back yard BBQ, church supper, or to surprise someone with a fuss-free meal just because you’re that kind of super nice person.

What’s up with the addition of apple cider vinegar? Is this ingredient necessary?

In my mind, YES! Please don’t leave it out!

The apple cider vinegar will cut through the heavy richness of the cheese sauce and bring a nice balance to the completed dish.

Don’t worry. The vinegar brightens and lightens the entire dish without adding a vinegary taste.

I do hope you’ll trust me on this! It will take your French Onion Mac and Cheese from fine to FAMOUS!!

How do I reheat this French onion mac and cheese?

From the refrigerator –

  • Allow the mac and cheese to sit on the counter for 30 minutes at room temperature while preheating the oven to 350-degrees.
  • Bake the casserole for 30 minutes, covered, and 10 minutes uncovered.
  • Serve and enjoy.

From the freezer –

  • Preheat the oven to 350-degrees for 30 minutes.
  • Place the frozen casserole in the oven (covered) and bake for 70 – 90 minutes.
  • Stir and check if the casserole is heated through.
  • Uncover, and continue to bake for an additional 30 minutes until the mac and cheese is melted, golden and bubbly.

Closeup photo of cheesy shells and cheese with caramelized onions.

Below is the printable recipe card along with the exact ingredient measurements and nutritional information for making today’s French Onion Mac and Cheese.

If you’ve made this recipe, or are excited to make this recipe, I’d appreciate it if you’d take a moment to leave it a star rating in the recipe card, along with a comment if you’re so inclined. Thank you. 🙂

Hand with a spoon serving up French onion mac and cheese out of a casserole dish.

French Onion Mac and Cheese

Renee – Kudos Kitchen
Ever wish you could make a mac and cheese recipe that you’d become famous for? You know, the one your friends and family would consider your signature dish? Look no further. My famous French Onion Mac and Cheese recipe has got your name written ALL over it, and I’m happily handing it to you so you can become the BBQ side dish star at your local block party! You’re welcome! 🙂

5 from 12 votes
Prep Time 30 mins
Cook Time 30 mins
Total Time 1 hr
Course Appetizer or Side Dish, Pasta
Cuisine American
Servings 12 servings
Calories 458 kcal


For the caramelized onions;

  • 3 large sweet onions sliced
  • 2 tablespoons avocado oil or other light colored oil
  • 3 sprigs fresh thyme
  • teaspoon coarse salt
  • ¼ teaspoon black pepper

For the cheese sauce;

  • 4 tablespoons butter
  • 2 tablespoons avocado oil or other light colored oil
  • 5 tablespoons all-purpose flour
  • 2 cups milk
  • 8 ounces Monterey Jack cheese cubed or shredded
  • 8 ounces sharp cheddar cheese cubed or shredded
  • 4 ounces mozzarella cheese shredded
  • 1 teaspoon apple cider vinegar
  • pinch coarse salt
  • pinch black pepper
  • 1 pound pasta cooked and drained according to the package directions
  • 1 tablespoon olive oil


  • Preheat the oven to 350-degrees.

To make the pasta;

  • Cook the pasta just shy of the package directions. Drain. Stir in 1 tablespoon of olive oil, set aside, and keep warm.

To make the caramelized onions;

  • In a large heavy bottom skillet over medium-high heat, add the avocado oil and the sliced onions. Stir well to coat the onions in the oil. Allow the onions to cook without stirring for approximately 5 minutes.
  • Reduce the heat to medium. Add the salt, pepper, and thyme to the onions and stir well. Continue to cook the onions, stirring only occasionally, until the onions are deeply caramelized and golden brown (approximately 20-25 minutes). 
  • Remove the onions to a bowl and discard the thyme sprigs. Set the onions aside.

To make the cheese sauce;

  • Melt the oil and butter in the same large skillet, over medium heat. Add the flour and cook, stirring occasionally for 1-2 minutes.
  • Add half of the milk to the butter-flour mixture (roux) and stir well to combine. Add the remaining milk to the skillet and stir well until the mixture thickens.
  • Season the thickened sauce with a pinch of salt, a pinch of pepper. Add the cubed and shredded cheddar, jack, and mozzarella cheese to the skillet, and stir continually until the cheese is completely melted and creamy.
  • Add the apple cider vinegar to the cheese sauce along with the caramelized onions, and the cooked and drained pasta. Stir well to combine.
  • Spoon the French onion macaroni and cheese evenly into a 4-quart casserole dish that has been prepared with cooking spray.
  • Bake the casserole in a preheated oven, uncovered, for 30 minutes or until the cheese lightly golden and bubbly.


This French onion mac and cheese can be made in advance and stored in the refrigerator for up to 2 days before baking. Allow the casserole to come to room temperature before baking as instructed.
The casserole may also be frozen before baking. Cover well and store in a freezer safe casserole dish. Freeze for up to 3 months. To reheat from frozen, cover and cook for 90 minutes at 350-degrees. Stir well, and then return to the oven, uncovered, for an additional 30 minutes (if needed).


Serving: 1servingCalories: 458kcalCarbohydrates: 39gProtein: 18gFat: 25gSaturated Fat: 12gCholesterol: 57mgSodium: 629mgPotassium: 282mgFiber: 2gSugar: 7gVitamin A: 565IUVitamin C: 4.5mgCalcium: 399mgIron: 1.2mg
Keyword baked macaroni and cheese casserole, French onion mac and cheese
Tried this recipe?Let us know how it was!

Thank you so much for visiting me here today in my Kudos Kitchen! 

I sincerely hope you’ve enjoyed today’s baked French Onion Mac and Cheese Casserole recipe as much as I’ve enjoyed bringing it to you!

Vertical photo of a spoonful of french onion macaroni and cheese with canisters in the background.

Kudos Kitchen by Renee – Bringing you easy, economical, and delicious dishes to feed the people you love!

Until we eat again, I hope you have a delicious day!!

Should you have any questions or comments regarding this recipe or anything else you’ve seen on my site, please don’t hesitate to reach out to me. It is always my distinct pleasure to get back with a reply just as soon as I possibly can!

Kudos Kitchen by Renee – Bringing you easy, economical, and delicious dishes to feed the people you love!

Until we eat again, I hope you have a delicious day!!

Small custom signature from Kudos Kitchen by Renee

**Note – The post above includes affiliate links. As always, I truly thank you for your support!

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Recipe Rating


Wednesday 27th of November 2019

What a great mix of cheeses to make this macaroni and cheese so dang good! It looks so creamy and delicious.


Friday 29th of November 2019

Thanks, Susan. There is nothing better than a great mac and cheese! Enjoy!


Wednesday 27th of November 2019

This mac and cheese was incredible!


Friday 29th of November 2019

Thank you, Gina! I'm glad you think so!! Enjoy!


Friday 3rd of May 2019

I really can't wait to try this! Looks and sounds so good!


Saturday 4th of May 2019

Thank you, Toni. You're going to love it!

Lindsay Cotter

Wednesday 1st of May 2019

Amazing flavors going on! Epic comfort food!


Thursday 2nd of May 2019

Thank you, Lindsay! I love that word, epic! LOL


Monday 29th of April 2019

Renee, this is genius! Loved every bit of this recipe, never thought of adding caramelized onions to mac and cheese. Thank you for sharing!


Monday 29th of April 2019

Thank you so much, Hadia! It is my pleasure to bring you something delicious! Enjoy!! Renee