In a medium-sized mixing bowl, add the sour cream and whisk it briefly until smooth and free of any lumps. This creates the creamy base that will bind all the sweet ingredients together.

Gently fold in the drained pineapple chunks, mandarin oranges, halved maraschino cherries, and miniature marshmallows. Use a rubber spatula or large spoon to combine everything just until evenly distributed. Be careful not to overmix or crush the fruit pieces.

Cover the bowl with plastic wrap or a lid and place in the refrigerator. Allow the salad to chill for at least 2 hours. This chilling time is important as it lets the flavors meld together and gives the marshmallows time to slightly soften and expand.

Give the salad a gentle stir before serving. Spoon into individual dishes or serve family-style in a decorative bowl. This salad should always be served cold, straight from the refrigerator, for the best taste and texture.