- Using a damp cloth, wipe mushrooms of any dirt and grit. Slice thinly. 
- In a skillet over medium-high heat, heat olive oil. Add mushrooms and cook, turning them midway, for about 4 to 5 minutes or until lightly browned.   
- Add garlic and cook for about 30 seconds or until softened.
 
 
- Increase heat to high. Add wine.  
- Season with salt and pepper to taste. Continue to cook, stirring as needed, until liquid is absorbed. 
- Spread butter on one side of each of the french bread slices. 
- Assemble sandwich by placing one slice of cheese on unbuttered side of bread, spoon 1/4 of mushroom mixture, add another slice of cheese and top with another bread slice unbuttered side down. 
- In a wide, thick-bottomed pan over medium heat or a preheated panini grill, place sandwiches buttered side down.  
- Grill for about 2 to 3 minutes on each side or until lightly browned and cheese is melted and gooey.