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Caramelized Onion and Mushroom Havarti Melt

Caramelized Onion & Mushroom Havarti Melt

Thick sliced bread topped with soft onions, sautéed mushrooms, and havarti cheese is the perfect grilled cheese combination! This caramelized onion and mushroom grilled cheese is a great easy meal!

Course Main Course
Cuisine American
Keyword caramelized onion and mushroom grilled cheese
Prep Time 5 minutes
Cook Time 7 minutes
Servings 2 sandwiches

Ingredients

  • 8 oz mushrooms roughly chopped
  • 1 medium onion thinly sliced
  • salt & pepper
  • ½ teaspoon thyme dried or fresh
  • 4 slices of thick sliced bread (like sourdough)
  • 4 slices havarti or Swiss cheese
  • 2 TBS butter

Instructions

  1. Heat skillet on medium heat and melt 1 TBS of butter; Add onions and mushrooms. After 5-7 minutes you'll notice the mushrooms ‘sweating’ (little beads of water coming to the surface) - Wait another minute and then toss around quickly; Wait about 5 more minutes. By this time their color should be turning a rich brown, and you can toss around a couple more times. Once they are a caramel color, sprinkle with thyme, salt and pepper and stir. Remove from heat.

  2. Using the remaining butter, evenly butter 1 side of each slice of bread. With the butter side facing down, place 1 slice of cheese on bread, then about ½ cup of mushroom mixture, then another slice of cheese, and then another slice of bread with the butter side up. Repeat for 2nd sandwich.

  3. Place the sandwiches into a skillet on medium heat (lower the heat if your bread is browning, but cheese isn't melting enough). Let cook for 3-4 minutes and then flip carefully to other side. Cook an additional 3-4 minutes or until browned.

  4. Remove from skillet, cut in half, and serve immediately.

Recipe Notes

*Do not cook sandwiches over high heat, this will toast the bread to quickly and not allow enough time for the cheese to melt. Slowly over medium head is the way to go.

Recipe first published in 2013. Updated 2/2025