Cut beef into 1/8 to 1/4 inch strips. Cut each strip into 2" long pieces. Place oil in hot stir fry pan and add garlic powder and beef strips. Stir fry for about 4 minutes. Remove from pan. Add zucchini to pan and cook for 2 to 3 minutes. Return beef to pan and add tomato halves and salad dressing. Heat through. Serve over hot pasta. Sprinkle parmesan cheese over prepared dish. Makes 4 servings.