BEST MUSHROOM GRILLED CHEESE SANDWICH

INGREDIENTS:

– 1 tablespoon butter
– 1 tablespoon olive oil
– 1 small onion, sliced
– 8 ounces cremini mushrooms, sliced
– 2 cloves garlic, chopped
– 1 teaspoon thyme, chopped
– 1/4 cup white wine or broth
– salt and pepper to taste
– 1 tablespoon parsley, chopped
– 1/2 teaspoon truffle oil (optional)
– 1 cup fontina or gruyere, shredded
– 1/4 cup parmigiano reggiano, grated
– 4 slices bread
– 2 tablespoon butter

DIRECTIONS:

Melt the butter and heat the oil in a pan over medium heat.

Add the onion and saute until tender, about 5-7 minutes.

Add the garlic and thyme and saute until fragrant, about a minute …