SEASON steak, if desired with salt and pepper. Heat 1 Tbsp. oil in large nonstick skillet over medium-high heat and cook steak, in batches, to desired doneness. Remove and set aside.
HEAT remaining oil in same skillet and cook mushrooms and green beans, stirring occasionally, 3 minutes. Stir in water and milk and bring to a boil. Stir in Knorr® Pasta Sides™ - Stroganoff; cover reduce heat and cook, stirring occasionally, 8 minutes or until pasta is tender.
STIR in steak and let stand 2 minutes. Sprinkle with chopped parsley; now it's delicious. Dig in!