Step 2
Heat a large nonstick skillet over medium-high heat. Add sausage and cook until golden brown, 6 to 8 minutes. Transfer to a bowl to cool. Add oil to the pan. Add mushrooms and cook, stirring often, until golden brown, 5 to 7 minutes. Transfer mushrooms to the bowl with the sausage. Let cool for 5 minutes. Stir in scallions, cheese and pepper.