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Swiss Mushroom Melt Sandwich

Irresistible Swiss Mushroom Melt Sandwich for Cozy Days

Enjoy the cozy and indulgent flavors of a Swiss Mushroom Melt Sandwich with earthy mushrooms, nutty cheese, and caramelized onions.
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Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Servings: 2 sandwiches
Course: Lunch
Cuisine: American
Calories: 430
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Caramelized Onions
  • 2 medium yellow onions substitute with red onions for a different flavor
  • 1 tablespoon olive oil enhances flavor
  • 1 tablespoon butter unsalted or vegan butter can be substituted
  • 1 teaspoon brown sugar can be substituted with honey or maple syrup
  • 1 tablespoon balsamic vinegar red wine vinegar is a great substitute
For the Mushroom Filling
  • 8 ounces cremini mushrooms button mushrooms can be used if unavailable
  • 2 cloves garlic can be omitted for a milder taste
  • 1/4 cup dry white wine omit if preferred or use vegetable broth
  • 1 teaspoon fresh thyme leaves dried thyme can be used in a pinch
For the Sandwich Assembly
  • 4 slices sourdough bread any favorite bread or gluten-free options
  • 4 ounces Swiss cheese Gruyere or provolone can be substituted
  • 2 tablespoons Dijon mustard optional; can be replaced with yellow mustard

Equipment

  • Skillet

Method
 

Step-by-Step Instructions
  1. Peel and slice the yellow onions thinly. Heat olive oil and butter in a skillet over medium-low heat. Add onions and cook for 30-45 minutes until deep golden brown.
  2. Stir in brown sugar and balsamic vinegar. Cook for an additional 3-5 minutes until glossy. Season with salt and black pepper, then set aside.
  3. Slice the cremini mushrooms. In the same skillet, add more olive oil and sauté mushrooms for 8-10 minutes until browned and tender.
  4. Add minced garlic and thyme. Sauté for 1 minute, then pour in dry white wine and let reduce for 2-3 minutes before seasoning.
  5. Butter one side of each slice of sourdough. On the unbuttered side, spread mustard, layer Swiss cheese, caramelized onions, and sautéed mushrooms, finishing with another slice of cheese.
  6. Cook the sandwiches in a skillet over medium-low heat for 3-5 minutes per side until golden brown and cheese is melted.
  7. Remove from skillet, cut in half, and serve hot with desired sides.

Nutrition

Serving: 1sandwichCalories: 430kcalCarbohydrates: 45gProtein: 15gFat: 22gSaturated Fat: 12gPolyunsaturated Fat: 1gMonounsaturated Fat: 10gCholesterol: 45mgSodium: 700mgPotassium: 400mgFiber: 3gSugar: 5gVitamin A: 500IUVitamin C: 1mgCalcium: 250mgIron: 2mg

Notes

Customize with grilled veggies or different cheeses. Store assembled sandwiches in an airtight container for up to 2 days.

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