French onion mac and cheese is the perfect combination of 2 favorites–creamy, cheesy macaroni and oniony, cheesy soup. Sharp Cheddar and Gruyère combine with caramelized onions to amp up the flavor. The breadcrumb topping just makes the whole thing that much more fantastic.

A large pot filled with French onion mac and cheese, with a few servings missing and a large serving spoon.

Adapted from MOB Kitchen | Comfort MOB | Mobius, 2021

At MOB Kitchen, we’re known for the kinds of dishes that’ll fill you up and warm you to your core. But it isn’t just about carbs and cheese, it’s about redefining comfort food. We realize that comfort is often about texture, warmth, and–perhaps most importantly–about the way that food makes you feel. Because comfort food isn’t just an arrangement of flavors or ingredients that have been scientifically calculated to make you feel a certain way. Comfort food is about coming home to the smell of your favorite meal after a bad day at work.–MOB Kitchen

WHAT IS LC HUMP DAY PASTA?

We’re glad you asked. LC Hump Day Pasta (#LCHumpDayPasta) is a little something we cooked up to help you on the night of the week that you feel least like cooking. Wednesday was traditionally Prince Spaghetti Day (for those of you old enough to remember). We’ve revamped and updated that to Hump Day and included every type of pasta there is.

French Onion Mac and Cheese

A large pot filled with French onion mac and cheese, with a few servings missing and a large serving spoon.

What happens when an unstoppable force meets an immovable object? The same thing that happens when French onion soup meets mac & cheese: glorious mayhem. The crispy caramelized onion and Gruyère topping on this dish is absolutely ridiculous.

MOB Kitchen

Prep 15 mins

Cook 45 mins

Total 1 hr

Caramelize the onions

  • In a large skillet over medium heat, melt 2 1/2 tablespoons butter. Add the onions with a good pinch of salt. Sauté, stirring occasionally and reducing the heat if necessary, until the onions have completely softened and caramelized, 30 minutes.
  • Once the onions are cooked, pour in the wine and add most of the thyme leaves, reserving a handful for garnish. Simmer until the wine has reduced by half, 2 to 4 minutes. The onions can be prepared in advance and kept in the fridge.

  • In a large saucepan of boiling salted water, cook macaroni for 2 minutes less than the package instructions instruct, then drain in a colander.

Make the cheese sauce

  • In a large ovenproof skillet over medium heat, add remaining 4 1/2 tablespoons butter. Tip in the flour and whisk to combine. Whisking constantly, slowly pour the cold milk into the flour mixture, a little at a time, to get a smooth sauce. Simmer the sauce until thickened, about 5 minutes.

  • Stir in Cheddar cheese and half of the Gruyère cheese. Once the cheese has melted, take sauce off the heat, add Dijon mustard, and season with salt and black pepper.
  • Preheat broiler to high heat.

  • Tip the cooked macaroni and caramelized onions into the cheese sauce, reserving a tablespoon of the onions. Mix well, then top with remaining onions, Gruyère cheese, and the breadcrumbs. Scatter over a handful more thyme leaves.

  • Broil until golden brown, 2 to 4 minutes. Serve immediately.

*What can I substitute for Gruyère?

That all depends on why you’re not using Gruyère. If you don’t like the taste but still want a second cheese in your dinner, consider something milder. Emmental is close–it has the same lovely meltiness but a milder flavor.
MOB Kitchen themselves suggested that if you just don’t want the expense of fancy cheeses, you can use all sharp Cheddar (so 14 ounces/400 grams in total). It won’t be as French oniony but it will still be incredible.

Serving: 1servingCalories: 656kcal (33%)Carbohydrates: 60g (20%)Protein: 26g (52%)Fat: 32g (49%)Saturated Fat: 19g (119%)Polyunsaturated Fat: 2gMonounsaturated Fat: 9gTrans Fat: 1gCholesterol: 91mg (30%)Sodium: 380mg (17%)Potassium: 359mg (10%)Fiber: 2g (8%)Sugar: 8g (9%)Vitamin A: 972IU (19%)Vitamin C: 1mg (1%)Calcium: 586mg (59%)Iron: 2mg (11%)

Recipe Testers’ Reviews

Originally published October 13, 2021

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