3 tb Butter or margarine 5 tb Flour 1 ts Salt 1/8 ts Pepper 1 3/4 c Chicken stock 3 c Cooked chicken 4 oz Mushroom stems & pieces, can -drained 1/4 c Canned pimiento, finely -chopped 8 Puff pastry shells, baked 1. Combine all ingredients except cheese and the second 1 cup of croutons in a 1 1/2-quart, heat-resistant, non-metallic casserole. 2. Sprinkle with cheese and the 1 cup of croutons or crushed potato chips. 3. Heat, uncovered, in Microwave Oven 6 to 8 minutes or until bubbly.