1. Remove and discard stems from mushrooms. Place mushrooms, cap side up, on a baking sheet coated with cooking spray. Brush tops with oil. Broil 4-6 in. from the heat for 4-5 minutes or until tender.
2. Spread half of the spaghetti sauce into an 11-in. x 7-in. baking dish coated with cooking spray. Place mushrooms on sauce, cap side down. Sprinkle with cheese. Drizzle with remaining spaghetti sauce. Sprinkle with Parmesan cheese.
3. Bake, uncovered, at 350° for 8-10 minutes or until heated through. Yield: 2 servings.