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This INCREDIBLY D E L I C I O U S grilled cheese is loaded with herbed caramelized onions, melted Gruyere and white cheddar cheeses, and cooked in a savory rosemary butter. The absolute best I have ever tasted.

One bite of this gourmet grilled cheese, and you’ll never want a regular grilled cheese again!  The crispy bread used was home made brioche ( prepared from scratch by culinary arts students ) then cooked in rosemary butter, layered with the gooey cheeses and an inside layer of sweet herbed caramelized onion… the ULTIMATE comfort food!


  • 8 slices day old brioche

  • 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!

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