1     pound         beef sirloin steak
2     tablespoons   Parkay Margarine
1/2   cup           chopped onion
1     can           mushrooms - (4 oz)
1/2   teaspoon      salt
1/4   teaspoon      dry mustard
1/4   teaspoon      freshly-ground black pepper
1     package       Philadelphia Brand Cream Cheese - (8 oz)
3/4   cup           milk
                    Hot parsleyed noodles