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Caramelized Mushroom and Onion Melt Sandwich Recipe

Caramelized Mushroom and Onion Melt Sandwich Recipe
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★★★★★

5.3 from 25 reviews

This Caramelized Mushroom and Onion Melt Sandwich is a rich and flavorful vegetarian delight featuring sautéed cremini mushrooms, sweet caramelized onions, spicy jalapeno, and fresh rosemary. Paired with creamy baby Swiss and Havarti cheeses and nestled between lightly toasted rustic bread, this melt is perfect for a comforting lunch or dinner. The combination of earthy mushrooms, sweet onions, and melty cheeses offers an irresistible depth of flavor, complemented by a touch of freshness from optional greens.

Ingredients

Scale

Bread and Butter

  • 2 Stecca’s or your favorite rustic sandwich bread, sliced in half lengthwise
  • 3 tbsp unsalted butter (divided)

Vegetables and Seasonings

  • 16 oz cremini mushrooms, stems removed, cleaned, and quartered
  • 2 small onions, halved and thinly sliced
  • 1 whole jalapeno pepper, seeds removed and thinly sliced
  • 1/2 tbsp fresh rosemary, finely minced
  • 1 tsp salt
  • 1 pinch cracked black pepper

Cheese and Spread

  • 4 slices baby Swiss cheese
  • 4 slices Havarti cheese
  • 2 tbsp mayonnaise

Optional

  • Fresh greens lightly tossed in olive oil for serving

Instructions

  1. Caramelize the Vegetables: Heat a large nonstick skillet over medium heat and add the mushrooms, sliced onions, jalapeno slices, and minced rosemary. Season with salt and black pepper, then add 1 tablespoon of the butter. Cook for a few minutes before stirring or flipping. Reduce the heat slightly and continue cooking for about 20 minutes, stirring occasionally, until the mushrooms and onions are deeply caramelized and have reduced in size. Set aside.
  2. Toast the Bread: Butter the remaining bread slices evenly on one side with the remaining 2 tablespoons of butter. Using a large skillet on medium heat, place the bread butter-side down and toast until golden and crisp. Repeat for all slices.
  3. Preheat Oven: Set your oven to 325°F (160°C) to warm and melt the sandwiches later.
  4. Assemble the Sandwiches: Spread a generous layer of mayonnaise on the bottom piece of bread. Layer two slices of baby Swiss cheese, then pile on the caramelized mushroom and onion mixture. Add two slices of Havarti cheese on top, then cover with the second slice of bread.
  5. Repeat: Assemble the second sandwich using the same method.
  6. Melt the Cheese: Place the assembled sandwiches on a baking sheet and bake in the preheated oven for 5-7 minutes, or until the cheese has melted beautifully.
  7. Serve: Remove from oven and slice each sandwich diagonally. Serve warm, optionally accompanied by a fresh green salad tossed lightly with olive oil.
  8. Enjoy: Bite into your sandwich to savor the earthy mushrooms, sweet onions, herby rosemary, and creamy melted cheeses all balanced by crunchy toasted bread. This melt is fulfilling and full of layered flavors perfect for any meal.

Notes

  • For extra heat, keep some jalapeno seeds in.
  • You can substitute cremini mushrooms with white button or portobello mushrooms for different textures.
  • Use gluten-free bread to make the sandwich gluten-free.
  • The sandwich is best enjoyed fresh but can be wrapped tightly and reheated carefully to retain the melt.
  • To make it vegan, use plant-based cheeses and vegan butter or margarine, and replace mayonnaise with a vegan alternative.

Nutrition

Keywords: caramelized mushroom sandwich, mushroom melt, onion melt sandwich, vegetarian sandwich, melted cheese sandwich, caramelized onions, rustic bread sandwich

Find it online: https://flavorsbymaya.com/caramelized-mushroom-and-onion-melt-sandwich-recipe/