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Swiss Mushroom Melt Sandwich Recipe

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4.8 from 614 reviews

The Swiss Mushroom Melt Sandwich is a deliciously savory and comforting sandwich featuring deeply caramelized onions, sautéed cremini mushrooms with garlic and thyme, melted Swiss cheese, and optional Dijon mustard layered between buttery, toasted sourdough bread slices. This recipe offers a perfect balance of sweet, earthy, and creamy flavors, ideal for a hearty 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

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 to ensure even cooking.
  2. Heat Oils: In a large skillet, heat olive oil and butter over medium-low heat to create a gentle cooking environment.
  3. Cook Onions: Add sliced onions, coat them evenly with fats, and cook over very low heat for 30-45 minutes, stirring occasionally until deep golden brown and very soft. Adjust heat to prevent burning.
  4. Caramelize: Stir in brown sugar and balsamic vinegar, cooking for 2-3 minutes while stirring constantly until sugar dissolves and vinegar is absorbed, then season with salt and pepper. Set aside.
  5. Prepare Mushrooms: Clean and slice cremini mushrooms to prepare them for sautéing.
  6. Sauté Mushrooms: In the same skillet, heat olive oil over medium-high heat. Add mushrooms and cook for 8-10 minutes until browned and softened, stirring occasionally. Avoid overcrowding by cooking in batches if necessary.
  7. Add Flavors: Stir in minced garlic and fresh thyme, cooking for another minute until garlic is fragrant.
  8. Deglaze: Pour in white wine, scrape browned bits from the skillet bottom, and let wine reduce for 1-2 minutes until nearly evaporated. Season mushrooms with salt and pepper and set aside.
  9. Prepare Bread: Lightly butter one side of each bread slice and spread Dijon mustard on the unbuttered side of two slices (optional).
  10. Build Sandwiches: Place bread buttered side down in a clean skillet over medium-low heat. Layer half of the Swiss cheese on each slice, then pile caramelized onions and sautéed mushrooms over the cheese on two slices.
  11. Cook Sandwiches: Top with the remaining bread slices, cook for 3-5 minutes per side until bread is golden and cheese is melted, covering skillet with a lid to help cheese melt evenly.
  12. Serve: Remove sandwiches carefully, stack one sandwich over the other if desired, cut in half, and serve immediately while warm and gooey.

Notes

  • Cooking the onions slowly over low heat is key to developing their deep caramelized flavor without burning them.
  • Using dry white wine adds brightness and helps deglaze the skillet but can be omitted if preferred or replaced with vegetable broth.
  • Butter one side of the bread for a rich, crispy crust and spread Dijon mustard on the other side for a subtle tangy kick, though this is optional.
  • Cook mushrooms in batches if necessary to avoid overcrowding, which causes steaming instead of browning.
  • Covering the skillet while grilling the sandwich helps the Swiss cheese melt perfectly gooey and warm.
  • Sourdough bread works best for this sandwich due to its sturdy texture and tangy flavor, but other bread types can be used.

Keywords: Swiss Mushroom Melt Sandwich, caramelized onions, sautéed mushrooms, melted Swiss cheese, savory sandwich, vegetarian sandwich, stovetop sandwich

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