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Delicious bowl of French onion soup mac and cheese topped with melted cheese.

French Onion Soup Mac and Cheese

A delicious fusion of French onion soup and classic mac and cheese, this dish features gooey pasta enveloped in a creamy cheese sauce with caramelized onions.
Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Course Comfort Food, Main Course
Cuisine American, French
Servings 6 servings
Calories 600 kcal

Ingredients
  

Onion Base

  • 3 large yellow onions, thinly sliced
  • 3 tbsp butter
  • 2 cloves garlic, minced
  • 1 tsp dried thyme
  • Salt and freshly ground black pepper, to taste

Sauce Ingredients

  • 3 tbsp all-purpose flour
  • 4 cups beef broth (or vegetable broth for a vegetarian option)
  • 1 cup half-and-half or heavy cream
  • 1.5 cups grated Gruyère cheese Alternatively, use fontina or a blend of Swiss.
  • 1 cup sharp white cheddar cheese, grated

Macaroni

  • 12 oz elbow macaroni Cook according to package instructions.

Toppings (optional)

  • ½ cup extra grated cheese for topping
  • French bread or baguette slices for toasting

Instructions
 

Caramelizing Onions

  • Cook the thinly sliced yellow onions in butter over low heat for 30-40 minutes, stirring occasionally until they are golden brown and caramelized.

Prepare the Sauce

  • Sprinkle flour over the caramelized onions and stir to coat evenly.
  • Gradually whisk in the beef or vegetable broth along with the half-and-half or heavy cream, stirring until the mixture is smooth and thickened.
  • Mix in the minced garlic and dried thyme, then melt in the Gruyère and sharp white cheddar cheeses, stirring until creamy.
  • Season with salt and freshly ground black pepper.

Combine and Bake

  • Cook the elbow macaroni according to package instructions until al dente. Drain and reserve a small amount of pasta water.
  • Combine the cooked macaroni with the creamy cheese sauce, ensuring every piece is coated.
  • Transfer to an oven-safe dish, topping with extra cheese and toasted baguette slices if desired.
  • Broil briefly until the top is bubbly and golden brown, watching closely to prevent burning.

Notes

For a twist, add a splash of white wine when cooking onions. You can also use different cheeses like pepper jack or smoked gouda for varied flavors.
Keyword Casserole, Cheesy Pasta, comfort food, French Onion Soup, Mac and Cheese