This gourmet grilled cheese is loaded with herbed caramelized onions, gooey Gruyere and white cheddar cheeses, and is cooked in a savory rosemary butter!
One bite of this ultra savory and gourmet grilled cheese, and you’ll never want a regular grilled cheese again! The crispy bread, cooked in rosemary butter, surrounds the gooey cheeses and an inside layer of sweet herbed caramelized onion… sheer comfort food perfection!
Let me just tell you, this is quite possibly the best sandwich I’ve ever made. There’s nothing more satisfying and comforting than a crunchy, gooey, melty grilled cheese!
I have a weird thing about yellow cheeses, so I chose my absolute favorite, Gruyere. Of course I had to add some extra cheeses, so I also went with a bit of white cheddar and one thin slice of Muenster. If you’d prefer a different cheese blend, by all means, go for it!
The hardest thing about this gourmet grilled cheese, is maybe fitting into your pants after you’re done… because you won’t be able to have just one sandwich!
While I think a great sandwich is good all on it’s own… sometimes you just need something to dip it in. I highly recommend my Slow Cooker Creamy Tomato Basil Soup!
If you really want to kick this gourmet grilled cheese up a notch or two… add some prosciutto slices or crispy bacon. Talk about pure heaven!!
Check out the notes section below the recipe for a secret trick to make sure you have the perfect melted cheese!
Did you make this? Be sure to leave a review below and tag me @the_chunky_chef on Facebook and Instagram!
Ingredients
- 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
Instructions
- 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!
Want to save this recipe for later? Click the heart in the bottom right corner to save to your own recipe box!
Chef Tips
Video
Nutrition Disclaimer
The Chunky Chef is not a dietician or nutritionist, and any nutritional information shared is an estimate. If calorie count and other nutritional values are important to you, we recommend running the ingredients through whichever online nutritional calculator you prefer. Calories can vary quite a bit depending on which brands were used.
Mitch Mertens says
Yes, yes, and yes! A delicious addition to any great soup.
Virginia A. Powell says
I hadn’t delved into the new craze for gourmet grilled cheese sandwiches yet; this was my first foray into the fun you all have been experiencing for a while now. Well, I’ll tell you, making them was a blast and serving to my neighbor for our weekly klatsch was perfect. But eating them was WOW! Thank you for the recipe!
Ginny says
First had this at a girlfriend’s Luncheon, then begged for recipe. I LOVED IT!!
My husband and I both love it and make it together! We serve for friends when they visit with rave reviews.
We just finished a one month RV trip and made these 3 times- we also serve with a good tomato soup! Thanks for terrific recipe.
Rowan says
Made this with parmesean rosemary crusty bread and added some garlic confit, I think I’m going into a food coma rn bc of how much I ate ☠️
Kim says
Soooooo good! Even my hubby liked it. He’s usually a plain grilled cheese person. Will add this to our meal rotation!
Angela Pearson says
Wasn’t sure about the Rosemary but it came out phenomenal !
Lisa O'Brien says
Thank you! Loved the caramelized onions.
Jason Frisco says
Absolutely delicious! I went light on the fresh herbs and used extra butter/olive oil! Perfection!! Thank you for this recipe.
L says
This is the BEST grilled cheese recipe. I make it to accompany tomato soup and it’s just delish. Love the addition of caramelized onions and herbs. I make it exactly as the recipe states and it is perfect. About to make it for the third time. Thank you!
Brit says
Absolutely delicious! The caramelized herbed onions took this grilled sammie to the next level. Thank you!
Tammy Stuart says
Oh my goodness. I would have taken a picture but it disappeared in seconds. I could eat another but I know I shouldn’t. The onions added so much and the fresh herbs…just delicious!!!
Jordan Ness says
No recipe
The Chunky Chef says
Why on earth would I have a recipe website and NOT have recipes? You scrolled past the recipe card to leave this comment. The recipe card has a large navy blue header color (to help it stand out), and there’s also a “jump to recipe” button at the top of the page that will take you directly to the recipe card.
Benjamin Harrison says
You can’t fix stupid.
Marie Peters says
This is the recipe I use every time for a grilled cheese sandwich! The caramelized onions and the fresh thyme and rosemary really make it special!
Deb Adams says
Amazing!!! Wow! Best ever. I feel like a chef in my own kitchen
Denise says
I cannot wait to make this sandwich. My mouth was watering as am reading the ingredients and getting them today I would definitely let you know how it turned out and I got one more little secret. I am adding a couple slices, crumbled beef bacon that’s because I have some already. Talk about your adult only grilled cheese sandwich just for the grown-ups.
Will says
This is good!!
Jennifer C says
This recipe is amazing and just reading it my mouth was already watering. Thank you for providing the perfect gourmet grilled cheese I have been looking for!