Eggs with chile

3 tablespoons peanut oil or 3 tablespoons canola oil or 3 tablespoons olive oil 4 medium white mushrooms , trimmed and cut into 1/4-inch dice 2 scallions ,[...]

6 squares of rosemary focaccia bread , halved horizontally (3-inch wide) 2 tablespoons extra virgin olive oil , plus more for brushing 10 ounces feta cheese ,[...]