An easy sandwich to put together but the flavors will make it seem as if you spent all day making it! The caramelized onions bring a sweet and unique flavor that helps make this sandwich irresistible! Get this caramelized onion, mushroom, and swiss cheese I Love Food, Good Food, Yummy Food, Soup And Sandwich, Sandwich Recipes, Grilled Sandwich, Panini Sandwiches, Veggie Sandwich, Sandwich Ideas
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