Grilled Cheese With Onion and Mushrooms

A different take on that old standby the grilled cheese sandwich.

• Ready In: 15 mins
• Serves: 4

Ingredients

• 1  medium onion
• 2  tablespoons butter
• 1  cup mushroom, sliced
•  sea salt
• 1  teaspoon  balsamic vinegar
• 4  slices swiss cheese
• 8  slices  sourdough bread

Directions

1. Slice the onion and saute in butter over medium heat until soft and golden brown, about 7-10 minutes, stirring occasionally.
2. Stir in mushrooms, cook at stir 2-3 minutes more; remove from heat.
3. Sprinkle onions and mushroom with sea salt and balsamic vinegar.
4. Place slices of cheese on 4 pieces bread, top each with onion-mushroom mixture and another slice of bread.
5. Cook on a griddle or skillet over medium heat until cheese is melted, 2-3 minutes per side.