Grown Up Grilled Cheese Sandwich

Elevate your comfort food game with this Grown-Up Grilled Cheese Sandwich—a decadent twist on a classic favorite! Made with perfectly crisped sourdough bread, a meltingly rich combination of Gruyère and sharp white cheddar cheeses, and a layer of sweet, balsamic-caramelized onions, this sandwich is anything but ordinary. Hints of Dijon mustard and fresh thyme add complexity and a gourmet flair, while every bite is packed with layers of savory, tangy, and buttery goodness. Quick to prep and ready in under 30 minutes, this indulgent grilled cheese is perfect for lunch, dinner, or a comforting snack. Serve it with a creamy tomato soup or a crisp green salad for a truly satisfying meal.

Nutriscore Rating: 48/100

Prep Time:10 mins

Cook Time:25 mins

Total Time:35 mins

Servings: 2

Ingredients

• 4 slices Sourdough bread
• 4 ounces Gruyère cheese
• 4 ounces Sharp white cheddar cheese
• 4 tablespoons Butter
• 1 tablespoon Olive oil
• 1 large Yellow onion
• 1 teaspoon Balsamic vinegar
• 2 teaspoons Dijon mustard
• 1 teaspoon Fresh thyme leaves
• 0.25 teaspoon Salt
• 0.25 teaspoon Black pepper

Directions

Step 1

Peel and thinly slice the yellow onion.

Step 2

Heat the olive oil in a skillet over medium heat. Add the onion slices and a pinch of salt. Cook, stirring occasionally, until the onions are soft and golden brown, about 15-20 minutes.

Step 3

Stir in the balsamic vinegar and fresh thyme leaves, cooking for an additional minute. Remove from heat and set aside.

Step 4

Grate the Gruyère cheese and sharp white cheddar cheese. Mix them together in a small bowl.

Step 5

Spread a thin layer of Dijon mustard onto one side of each sourdough bread slice.

Step 6

Evenly divide the cheese mixture onto two of the bread slices (on the mustard side). Top with the caramelized onions.

Step 7

Place the remaining slices of bread on top, mustard-side down, to create two sandwiches.

Step 8

Spread 1 tablespoon of butter on the outside of each side of the sandwiches.

Step 9

Heat a clean skillet or griddle over medium-low heat. Add the sandwiches and cook for 3-4 minutes on each side, pressing down gently with a spatula, until the bread is golden brown and the cheese is melted.

Step 10

Remove from heat, slice the sandwiches in half, and serve immediately.

Nutrition Facts

Serving size	688.7 grams (688.7g)

Amount per serving	% Daily Value*
Calories	2023

Total Fat 137.30g	176%
Saturated Fat 73.50g	368%
Polyunsaturated Fat 4.70g
Cholesterol 398mg	133%
Sodium 3660mg	159%
Total Carbohydrate 117.60g	43%
Dietary Fiber 6.80g	24%
Total Sugars 12.40g
Protein 84.30g	169%

Vitamin D 61IU	303%
Calcium 2086mg	160%
Iron 6mg	34%
Potassium 586mg	12%

*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: 60.5%

Protein: 16.5%

Carbs: 23.0%