Easy but Good Spinach Dip

Description
This recipe came from an estate sale. I obtained it when I purchased the family collection from the Printey Estate in Forney, Texas in 2001.
 * Contributed by Catsrecipes Y-Group

Ingredients

 * 10 ounce package frozen spinach drained and chopped
 * 1 cup mayonnaise
 * 8 ounces sour cream
 * ½ cup white onions chopped
 * 1 packet ranch salad dressing

Directions

 * 1) In mixing bowl combine spinach, mayonnaise, sour cream, onions and ranch dressing then refrigerate for 2 hours or overnight for best flavor.