Swiss Cheese Parmesan Onion Soup

Rich, hearty, and irresistibly indulgent, this Swiss Cheese Parmesan Onion Soup elevates the classic French onion soup with a luxurious blend of Swiss and Parmesan cheeses melted atop golden, toasty baguette slices. Featuring deeply caramelized yellow onions, a splash of dry white wine for depth, and a robust beef broth base infused with thyme and bay leaf, this comforting soup is perfect for cozy evenings. The magic happens under the broiler, where the cheeses transform into a bubbly, golden crust that blankets the aromatic soup beneath. Easy to prepare yet sophisticated enough for entertaining, this recipe offers an unforgettable combination of sweet, savory, and umami. Don’t forget to serve it piping hot to let every velvety spoonful shine! Keywords: Swiss Cheese Parmesan Onion Soup, caramelized onions, French onion soup, cheese-topped soup, comfort food soup.

Nutriscore Rating: 67/100

Prep Time:15 mins

Cook Time:60 mins

Total Time:75 mins

Servings: 6

Ingredients

• 3 tablespoons unsalted butter
• 1 tablespoon olive oil
• 5 large yellow onions
• 3 cloves garlic cloves
• 1 teaspoon granulated sugar
• 1 tablespoon all-purpose flour
• 1 cup dry white wine
• 6 cups beef broth
• 1 leaf bay leaf
• 2 sprigs fresh thyme sprigs
• 1 loaf baguette
• 1.5 cups Swiss cheese
• 0.5 cups Parmesan cheese
• 0 to taste salt
• 0 to taste black pepper

Directions

Step 1

Peel and thinly slice the yellow onions into even slices. Mince the garlic cloves and set them aside.

Step 2

In a large, heavy-bottomed pot, heat the unsalted butter and olive oil over medium heat until melted.

Step 3

Add the sliced onions to the pot, stirring to coat them in the butter and oil. Sprinkle the onions with the granulated sugar to help them caramelize.

Step 4

Cook the onions, stirring occasionally, for 30-35 minutes, or until deeply golden and caramelized. Reduce the heat to medium-low if the onions begin to stick or brown too quickly.

Step 5

Stir in the minced garlic and cook for an additional 1-2 minutes until fragrant.

Step 6

Sprinkle the all-purpose flour over the onions, stirring constantly, and cook for 1-2 minutes to remove the raw flour taste.

Step 7

Deglaze the pan by pouring in the dry white wine. Scrape up any browned bits from the bottom of the pot with a wooden spoon.

Step 8

Add the beef broth, bay leaf, and thyme sprigs. Bring the mixture to a simmer and let it cook for 20 minutes to allow the flavors to meld.

Step 9

While the soup simmers, preheat the oven to 400°F (200°C) and slice the baguette into 1/2-inch thick slices.

Step 10

Place the baguette slices on a baking sheet and toast them in the oven for 5-7 minutes, flipping halfway through, until golden and crisp.

Step 11

Remove the bay leaf and thyme sprigs from the soup. Season with salt and black pepper to taste.

Step 12

Preheat your oven’s broiler. Ladle the soup into oven-safe bowls and place a toasted baguette slice on top of each bowl of soup.

Step 13

Top each baguette slice with a generous amount of shredded Swiss cheese and Parmesan cheese.

Step 14

Place the bowls on a baking sheet and broil in the oven for 2-4 minutes, or until the cheese is melted and bubbling.

Step 15

Carefully remove the bowls from the oven, let cool slightly, and serve immediately.

Nutrition Facts

Serving size	(3050.2g)

Amount per serving	% Daily Value*
Calories	2457.9

Total Fat 84.4g	0%
Saturated Fat 41.1g	0%
Polyunsaturated Fat 1.8g
Cholesterol 194.2mg	0%
Sodium 10358.6mg	0%
Total Carbohydrate 268.1g	0%
Dietary Fiber 21.6g	0%
Total Sugars 55.6g
Protein 123.8g	0%

Vitamin D 6.5IU	0%
Calcium 2475.0mg	0%
Iron 18.7mg	0%
Potassium 2695.8mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 32.6%

Protein: 21.3%

Carbs: 46.1%