French Onion Soup Mac & Cheese Recipe
French Onion Soup Mac & Cheese is a comforting twist on the classic mac and cheese, infused with the rich, caramelized flavor of slow-cooked onions and layers of melty Gruyère, cheddar, and mozzarella cheeses. Baked to golden perfection with a crispy Parmesan breadcrumb topping, this dish perfectly combines the savory depth of French onion soup with creamy pasta indulgence.
- Prep Time: 15 minutes
- Cook Time: 55 minutes
- Total Time: 1 hour 10 minutes
- Yield: 6 servings 1x
- Category: Main Dish
- Method: Baking
- Cuisine: French-American
Ingredients
Scale
Pasta
- 12 ounces elbow macaroni
Onion Base
- 3 large yellow onions, thinly sliced
- 2 tablespoons olive oil
- 3 tablespoons butter, divided
- 2 cloves garlic, minced
- 1 teaspoon fresh thyme (or 1/2 teaspoon dried thyme)
Sauce
- 3 tablespoons flour
- 2 cups vegetable broth
- 2 cups whole milk
- 1/2 cup heavy cream
Cheese
- 2 cups shredded Gruyère cheese
- 1 cup shredded sharp cheddar cheese
- 1 cup shredded mozzarella cheese
Seasonings and Topping
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1 cup breadcrumbs
- 1/2 cup grated Parmesan cheese
Instructions
- Preheat Your Equipment: Preheat your oven to 375°F (190°C) and butter a baking dish thoroughly to prevent sticking and for easy cleanup.
- Caramelize the Onions: Heat olive oil and 1 tablespoon of butter in a skillet over medium heat. Add the thinly sliced onions and cook gently, stirring often, until they become deeply caramelized and golden brown, about 25 to 30 minutes. This slow-cooking process develops rich, sweet flavors. Stir in minced garlic and thyme towards the end to add aromatic depth.
- Make the Roux: Add the remaining 2 tablespoons of butter to the skillet with the onions, allowing it to melt. Stir in the flour and cook for a minute to form a roux, which will thicken the sauce.
- Prepare the Cheese Sauce: Gradually whisk in the vegetable broth, followed by the whole milk and heavy cream, stirring continuously until the mixture is smooth and starts to thicken.
- Add Cheese and Season: Stir in Gruyère, sharp cheddar, and mozzarella cheeses until fully melted and creamy. Season the sauce with salt and black pepper to taste.
- Combine Pasta and Sauce: Cook the elbow macaroni until al dente according to package directions, drain, then toss with the cheese sauce and caramelized onions, ensuring the pasta is evenly coated.
- Assemble the Dish: Transfer the mac and cheese mixture into the prepared buttered baking dish.
- Add Topping: Mix the breadcrumbs with grated Parmesan cheese and sprinkle evenly over the top of the dish to create a crunchy golden crust during baking.
- Bake: Place the baking dish in the preheated oven and bake for 20 to 25 minutes until the topping is bubbly and golden brown.
- Serve: Remove from the oven and let the dish rest for 5 minutes. Garnish with fresh thyme if desired and serve hot for the best flavor experience.
Notes
- Caramelizing onions slowly over medium heat is key to developing the deep sweet flavor typical of French onion soup.
- Using a blend of Gruyère, cheddar, and mozzarella balances sharpness, creaminess, and meltiness in the cheese sauce.
- Ensure pasta is al dente before baking to prevent it from becoming mushy in the casserole.
- The breadcrumb and Parmesan topping adds a delicious crunchy texture contrast to the creamy pasta.
- If you prefer a richer sauce, you can add a touch more heavy cream before baking.
- Vegetable broth can be substituted with beef broth for a more traditional French onion soup flavor, but it will affect the dietary classification.
Keywords: French onion soup, mac and cheese, baked pasta, caramelized onions, Gruyère, comfort food, cheesy casserole
