Macaroni Salad

1 (8 ounce) package seashell macaroni
3 hardboiled eggs
1/2 cup chopped onion
1/2 cup chopped celery
1/2 cup chopped ripe olives
1 cup shredded sharp Cheddar cheese
1 cup salad dressing or mayonnaise
1 teaspoon salt
1 teaspoon pepper
1/2 teaspoon garlic powder

Cook macaroni according to package directions, until just tender. Drain.

Mix macaroni and remaining ingredients in large bowl. Place in serving casserole dish and chill.