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Swiss Mushroom Melt Sandwich

Melt-In-Your-Mouth Swiss Mushroom Melt Sandwich Joy

Experience the delicious Swiss Mushroom Melt Sandwich, featuring caramelized onions and savory mushrooms.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 2 sandwiches
Course: Lunch
Cuisine: Vegetarian
Calories: 450
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Caramelized Onions
  • 2 Yellow Onions Can substitute with red onions.
  • 1 tablespoon Olive Oil Can replace with butter.
  • 1 tablespoon Brown Sugar Maple syrup can be an alternative.
  • 1 tablespoon Balsamic Vinegar Can substitute with red wine vinegar.
For the Mushroom Filling
  • 8 ounces Cremini Mushrooms Portobello mushrooms can be used as a substitute.
  • 2 cloves Garlic Can be omitted for a milder taste.
  • 1/4 cup Dry White Wine Replace with vegetable broth for a non-alcoholic version.
  • 1 teaspoon Fresh Thyme Leaves Dried thyme can be used if fresh is unavailable.
For the Sandwich Assembly
  • 4 slices Sourdough Bread Any favored bread will work.
  • 4 ounces Swiss Cheese Gruyère cheese can be a great alternative.
  • 2 tablespoons Softened Butter Can use olive oil for lighter preparation.
  • 2 tablespoons Dijon Mustard Can be omitted for a milder flavor.

Equipment

  • large skillet

Method
 

Step‑By‑Step Instructions
  1. Begin by peeling and thinly slicing the yellow onions. Set aside.
  2. Heat olive oil and butter in a large skillet over medium-low heat. Add sliced onions and cook for 30-45 minutes.
  3. Once caramelized, stir in brown sugar and balsamic vinegar. Cook a few more minutes.
  4. Clean and slice the cremini mushrooms. Heat more olive oil in the skillet.
  5. Add sliced mushrooms and sauté for about 8-10 minutes until browned and tender.
  6. Add minced garlic and fresh thyme to the mushrooms. Cook until fragrant.
  7. Pour in dry white wine, scraping up browned bits. Let it reduce for 2-3 minutes.
  8. Butter one side of each slice of sourdough bread. Spread Dijon mustard on the unbuttered sides.
  9. In the skillet, layer cheese, caramelized onions, mushrooms, and more cheese, then top with the second slice.
  10. Cook until the bread is golden brown and cheese melts, about 3-5 minutes per side.
  11. Transfer the sandwich to a cutting board, cut in half, and serve hot.

Nutrition

Serving: 1sandwichCalories: 450kcalCarbohydrates: 48gProtein: 15gFat: 22gSaturated Fat: 10gCholesterol: 40mgSodium: 800mgPotassium: 500mgFiber: 3gSugar: 6gVitamin A: 600IUVitamin C: 2mgCalcium: 350mgIron: 3mg

Notes

For best results, store leftovers in an airtight container and reheat in a skillet.

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