Add 1 tablespoon olive oil to skillet. Add mushrooms and onions and stir-fry for 1-2 minutes or until crisp-tender. Remove from skillet and wipe skillet clean with paper towels.
Stack cutlets and cut crosswise in half, then cut each stack lengthwise into matchstick-size pieces. Heat 1 tablespoon oil in 12-inch nonstick skillet over high heat; stir-fry pork for 2 minutes or until no longer pink. Remove from skillet with slotted spoon. Salt to taste.