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–+ servings
Swiss Mushroom Melt Sandwich

Savory Swiss Mushroom Melt Sandwich

A delightful Swiss Mushroom Melt Sandwich filled with caramelized onions and gooey Swiss cheese, perfect for a cozy lunch.
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Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings: 2 sandwiches
Course: Lunch
Cuisine: Vegetarian
Calories: 450
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Caramelized Onions
  • 2 large yellow onions Can substitute with shallots for a milder flavor.
  • 2 tablespoons olive oil Can substitute with avocado oil.
  • 1 tablespoon butter Use margarine for a dairy-free option.
  • 1 tablespoon brown sugar Can substitute with maple syrup for a unique flavor.
  • 1 tablespoon balsamic vinegar Can replace with red wine vinegar if needed.
For the Mushrooms
  • 8 oz cremini mushrooms Button mushrooms can be used as a substitute.
  • 2 cloves garlic Fresh garlic preferred, garlic powder can suffice.
  • 1/4 cup dry white wine Optional; use vegetable broth to keep it non-alcoholic.
  • 1 teaspoon fresh thyme leaves Dried thyme can be used in lesser quantity.
For the Sandwich
  • 4 slices sourdough bread Whole wheat or gluten-free bread can be alternatives.
  • 8 oz Swiss cheese Gruyère or provolone can be used as substitutes.
  • 2 tablespoons softened butter For grilling the bread.
  • 1 tablespoon Dijon mustard Consider using whole-grain mustard as an alternative.

Equipment

  • skillet

Method
 

Step-by-Step Instructions
  1. Slice the onions thinly, heat olive oil and butter in a skillet over low heat, add onions, and sauté until golden brown (30–45 minutes).
  2. Stir in brown sugar and balsamic vinegar; cook for 2–3 minutes until sticky and sweet.
  3. In another skillet, heat olive oil, add mushrooms, and sauté for 8–10 minutes. Then add minced garlic and thyme, cook for another minute.
  4. Pour in dry white wine and let simmer for a minute; season mushrooms with salt and pepper.
  5. Butter one side of each slice of bread and spread Dijon mustard on the unbuttered sides of two slices.
  6. On the buttered sides, layer Swiss cheese, caramelized onions, and sautéed mushrooms, finishing with remaining cheese before placing the other slices on top.
  7. Grill sandwiches over medium heat for 3–5 minutes per side, using a lid for the last minute to melt the cheese.
  8. Slice the sandwiches in half and serve immediately.

Nutrition

Serving: 1sandwichCalories: 450kcalCarbohydrates: 45gProtein: 15gFat: 25gSaturated Fat: 10gPolyunsaturated Fat: 1gMonounsaturated Fat: 4gCholesterol: 30mgSodium: 700mgPotassium: 500mgFiber: 3gSugar: 5gVitamin A: 300IUVitamin C: 2mgCalcium: 250mgIron: 3mg

Notes

Store leftovers in an airtight container for up to 2 days, or freeze wrapped sandwiches for a month. Reheat in a skillet covered with a lid for best results.

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