Irish chef Stuart O'Keeffe shares his recipe for a delicious grilled cheese sandwich.

This is the perfect hearty grilled cheese!

Like many great sandwiches, it takes some time to prepare, but the result is incredible. There is nothing quite as comforting as digging into a warm and hearty sandwich for lunch or dinner.

Caramelized onions, mushroom, and brie grilled cheese recipe


  • 4 (thickly cut) slices of bread
  • Brie cheese
  • 1 onion, sliced
  • 2 cloves garlic
  • 10 mushrooms, sliced
  • 1/2 cup beef broth
  • 1⁄2 teaspoon thyme
  • 1 teaspoon all-purpose flour
  • 3 tablespoons butter
  • Salt & pepper


Heat a heavy skillet over medium heat, melt 2 tablespoons butter and cook onions at a low temperature for about 15 minutes until they become nice and caramelized.

Add mushrooms and garlic and cook for further 6-8 minutes.

Stir in beef stock and all purpose-flour and bring to a simmer until a nice sauce forms. Add thyme.

Butter bread with remaining butter and place Brie and mushroom onion topping between the buttered slices (make sure buttered sides are on the outside).

Place sandwich on a hot non-stick pan for about 3 minutes per side or until it becomes nice and brown.

Tip: Using another heavy saucepan, you can press on the sandwich while cooking for a pressed sandwich, if desired.

Check out Stuart's Facebook page and website for culinary tips, recipes, and food travels.

* Originally published in 2014. Updated June 2024.