Easy Tomato Baked Chicken

1 small red onion, thinly sliced
4 small boneless skinless chicken breast halves (1 lb.)
1 2 C. diced tomatoes
1/4 C. vinaigrette dressing
1/4 tsp. garlic powder
1/4 C. grated Parmesan cheese

Preheat oven to 425. Place onions in bottom of 9x13 baking dish; top with chicken. Combine tomatoes, dressing and garlic powder; pour over chicken. Sprinkle with cheese. Bake 30 minutes or until chicken is cooked thoroughly.

Makes 4 servings