Cashew -Chicken Pasta Salad

1 pkg. rotini pasta
4 cups chicken, cooked and cubed
1 can pineapple tidbits, drained
1 1/2 c. slivered celery
2 cups seedless grapes
 1 5 oz pkg. dried cranberries
1 cup ranch dressing
1/4 c. mayo
1 teas onion powder
Cook pasta according to package directions. Drain, cool. Combine with remaining ingredients. Cover and refrigerate at least an hour.