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Ultimate Grilled Cheese | Gooey Gruyere and white cheddar cheese, savory rosemary butter, and herbed caramelized onions... need I say more? | http://thechunkychef.com
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4.73 from 36 votes

Ultimate Gourmet Grilled Cheese

This gourmet grilled cheese is loaded with herbed caramelized onions, gooey gruyere and white cheddar cheeses, and is cooked in a savory rosemary butter!
Prep Time10 mins
Cook Time15 mins
Total Time25 mins
Servings: 4 servings
Calories: 909kcal
Author: The Chunky Chef


  • 8 slices good quality bread I used thick cut Artisan bread
  • Mayonnaise for spreading
  • 12 oz Gruyere cheese sliced thinly OR grated, at room temperature
  • 6 oz White cheddar cheese sliced thinly OR grated, at room temperature
  • 4 slices thin Muenster cheese at room temperature
  • 2 yellow onions diced
  • 1 tsp fresh thyme minced
  • 2 tsp fresh rosemary minced, divided
  • 1 tsp brown sugar
  • Salt and pepper to taste
  • 3 Tbsp butter divided
  • 1 Tbsp olive oil


  • Add 1 1/2 Tbsp butter and olive oil to a skillet and heat over MED-LOW heat. Add diced onions, salt, pepper, fresh thyme and 1 tsp of fresh rosemary to the hot skillet and saute, stirring often, until onions are soft and starting to brown, about 10 minutes.
  • Stir brown sugar into the onions and cook another minute.
  • Transfer onions to a plate.
  • Spread one side of two pieces of bread with a little bit of mayonnaise.
  • To the same skillet, add remaining butter and rosemary, and heat over MED heat. Swirl to coat the bottom of the skillet with the melted butter.
  • Add both pieces of bread, mayonnaise side down, and cook until bread is golden brown and crunchy, about 2-3 minutes.
  • As soon as you add the bread to the skillet, add a bit of cheese to the top of each piece of bread. Once it starts to melt a little, sprinkle a couple tablespoons of the caramelized onions over the top of one of the pieces of bread.
  • When the bread is good and golden brown, sandwich the pieces of bread together and cook on LOW until cheese is fully melted.
  • Transfer to a plate, repeat with remaining slices of bread and ingredients.
  • Slice and enjoy!



1. If you're having trouble getting your cheese to melt, add all the cheese to a food processor and pulse until they form a paste. Use as directed.


Calories: 909kcal | Carbohydrates: 34g | Protein: 49g | Fat: 64g | Saturated Fat: 36g | Cholesterol: 187mg | Sodium: 1094mg | Potassium: 330mg | Fiber: 3g | Sugar: 7g | Vitamin A: 1780IU | Vitamin C: 4.4mg | Calcium: 1460mg | Iron: 2.6mg