Cheese: Add mushrooms and cook until golden brown, 15 minutes. Shape into 2 or 3 mounds then top each with cheese. Cover and cook until cheese melts, 1 to 2 minutes. Transfer to rolls or buns and serve warm.
Cheese: Add mushrooms and cook until golden brown, 15 minutes. Shape into 2 or 3 mounds then top each with cheese. Cover and cook until cheese melts, 1 to 2 minutes. Transfer to rolls or buns and serve warm.