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Swiss Mushroom Melt Sandwich: The Ultimate Recipe

Swiss Mushroom Melt Sandwich: The Ultimate Recipe
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★★★★★

5 from 19 reviews

The Swiss Mushroom Melt Sandwich is a decadent, savory delight featuring caramelized onions and sautéed cremini mushrooms layered with melted Swiss cheese on toasted sourdough bread. This ultimate comfort food recipe combines rich, deep flavors with a crispy, gooey texture that satisfies every cheese and mushroom lover’s craving.

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 to ensure even caramelization during cooking.
  2. Heat Pan for Onions: In a large skillet, heat olive oil and butter over medium-low heat to create a perfect base for slow cooking the onions.
  3. Cook Onions: Add sliced onions to the skillet and stir to coat with oil and butter. Cook over very low heat, stirring occasionally for 30-45 minutes until onions are deeply golden and soft. Lower heat if they begin to brown too quickly.
  4. Add Flavor to Onions: Stir in brown sugar and balsamic vinegar, cooking for 2-3 minutes while stirring constantly until sugar dissolves and vinegar is absorbed by onions.
  5. Season Onions: Add salt and freshly ground black pepper to taste, then remove the caramelized onions from skillet and set aside.
  6. Prepare Mushrooms: Clean and slice the cremini mushrooms to get them ready for sautéing.
  7. Heat Pan for Mushrooms: Using the same skillet, heat olive oil over medium-high heat for mushrooms.
  8. Cook Mushrooms: Add sliced mushrooms and cook, stirring occasionally, for 8-10 minutes until they are browned and softened. Cook in batches if necessary to avoid overcrowding.
  9. Add Garlic and Thyme: Add minced garlic and fresh thyme leaves, cooking for a further minute while stirring constantly until garlic is fragrant.
  10. Deglaze with Wine: Pour white wine into the skillet and scrape the browned bits off the bottom. Reduce the wine for 1-2 minutes until nearly evaporated to concentrate the flavor.
  11. Season Mushrooms: Season mushrooms with salt and pepper, then remove from skillet and set aside.
  12. Prepare Bread: Lightly butter one side of each sourdough slice for toasting.
  13. Apply Mustard: Spread a thin layer of Dijon mustard on the unbuttered side of two bread slices for extra tangy flavor.
  14. Assemble Sandwiches: Place bread slices butter side down in a clean skillet over medium-low heat. On these slices, add half the Swiss cheese on each.
  15. Add Fillings: On top of the cheese on one slice, pile half the caramelized onions and half the sautéed mushrooms. Repeat for the other slice.
  16. Grill Sandwiches: Cook sandwiches for 3-5 minutes per side until the Swiss cheese is melted and bread is golden and toasted. Cover skillet with a lid to accelerate melting.
  17. Serve: Carefully remove sandwiches from the pan, stack one slice atop the other to form a full sandwich. Cut in half and serve immediately for maximum gooey deliciousness.

Notes

  • Use low heat to caramelize onions slowly for the best flavor and texture.
  • Cooking mushrooms in batches avoids steaming, ensuring a nice sear and flavor.
  • White wine is optional but adds depth; you can substitute vegetable broth if preferred.
  • Dijon mustard adds a pleasant zing but can be omitted for milder taste.
  • Use sourdough or any sturdy bread for best structural integrity with the fillings.
  • Covering the skillet helps melt the Swiss cheese evenly and faster.
  • For a vegan version, substitute butter with plant-based margarine and use vegan cheese.

Nutrition

Keywords: Swiss mushroom melt, caramelized onion sandwich, sautéed mushrooms, vegetarian sandwich, melted Swiss cheese, comfort food, mushroom sandwich recipe

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