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Swiss Mushroom Melt Sandwich Recipe

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★★★★★

4.8 from 138 reviews

A comforting and savory Swiss Mushroom Melt Sandwich featuring caramelized onions, sautéed cremini mushrooms, and melted Swiss cheese layered between slices of buttery toasted sourdough bread. This hearty vegetarian sandwich is perfect for a satisfying lunch or dinner.

Ingredients

Scale

Caramelized Onions

  • 2 large yellow onions, thinly sliced
  • 2 tablespoons olive oil
  • 1 tablespoon butter
  • 1 teaspoon brown sugar
  • 1/2 teaspoon balsamic vinegar
  • Salt and freshly ground black pepper to taste

Sautéed Mushrooms

  • 1 pound cremini mushrooms, sliced
  • 2 tablespoons olive oil
  • 2 cloves garlic, minced
  • 1/4 cup dry white wine (optional, but recommended)
  • 1 tablespoon fresh thyme leaves
  • Salt and freshly ground black pepper to taste

Sandwich Assembly

  • 4 slices sourdough bread (or your favorite bread)
  • 4 ounces Swiss cheese, thinly sliced
  • 2 tablespoons butter, softened
  • 1 tablespoon Dijon mustard (optional)

Instructions

  1. Prepare onions: Peel and thinly slice the yellow onions evenly to ensure even cooking.
  2. Heat fat: In a large skillet, heat the olive oil and butter over medium-low heat until melted and combined.
  3. Cook onions: Add the sliced onions to the skillet, tossing to coat them fully with the fat.
  4. Caramelize onions: Cook the onions slowly over very low heat, stirring occasionally for 30-45 minutes until they turn a deep golden brown and become very soft. Adjust heat as needed to prevent burning.
  5. Add sugar and vinegar: Stir in brown sugar and balsamic vinegar, cooking for an additional 2-3 minutes while stirring constantly until sugar dissolves and vinegar is absorbed.
  6. Season onions: Season with salt and freshly ground black pepper to taste, then remove from skillet and set aside.
  7. Prepare mushrooms: Clean and slice cremini mushrooms evenly.
  8. Heat oil: In the same skillet, heat olive oil over medium-high heat to prepare for sautéing mushrooms.
  9. Sauté mushrooms: Add sliced mushrooms and cook, stirring occasionally for 8-10 minutes, until browned and softened. Work in batches if necessary to avoid overcrowding, which can cause steaming instead of browning.
  10. Add garlic and thyme: Add minced garlic and fresh thyme leaves, cooking for an additional minute while stirring constantly until garlic is fragrant.
  11. Deglaze with wine: Pour white wine into the skillet, scraping up browned bits from the pan bottom. Allow the wine to reduce for 1-2 minutes until almost evaporated.
  12. Season mushrooms: Season sautéed mushrooms with salt and freshly ground black pepper to taste, remove from skillet, and set aside.
  13. Prepare bread: Lightly butter one side of each sourdough bread slice evenly.
  14. Add mustard: Spread a thin layer of Dijon mustard on the unbuttered side of two bread slices for added flavor if desired.
  15. Assemble sandwiches in skillet: Place bread slices buttered side down in a clean skillet over medium-low heat. Layer half of the Swiss cheese on each slice.
  16. Add toppings: On top of the cheese on one slice, pile half of the caramelized onions and half of the sautéed mushrooms. Repeat for the second slice.
  17. Cook sandwiches: Cook sandwiches for 3-5 minutes per side, until the bread is golden brown and toasted and the cheese is melted and gooey. Cover skillet with a lid during cooking to help cheese melt faster.
  18. Finish and serve: Remove sandwiches carefully from the skillet, place one slice on top of the other to make a complete sandwich, then slice in half and serve immediately for best flavor and texture.

Notes

  • Cooking onions slowly over low heat is key for proper caramelization and sweetness development.
  • Using dry white wine enhances mushroom flavor but can be omitted for a non-alcoholic version.
  • Butter the bread for a crispy golden crust when toasted in the skillet.
  • Covering the pan while cooking sandwiches helps melt the cheese thoroughly.
  • This sandwich is best served immediately while warm and cheese is gooey.

Keywords: Swiss mushroom melt, caramelized onion sandwich, sautéed mushrooms, vegetarian sandwich, melted Swiss cheese, sourdough sandwich

Find it online: https://delishfamilyrecipe.com/swiss-mushroom-melt-sandwich-recipe/