Begin by opening your cans of fruit cocktail, pineapple chunks, and mandarin orange slices, and pour them into a colander. Rinse the fruits under cold water to remove any syrup, then let them drain thoroughly for about 5 minutes. After draining, gently pat the fruits dry with a clean towel.

In a large mixing bowl, add the sour cream along with the orange-flavored gelatin powder. Using a whisk or spatula, mix them together until fully combined, creating a smooth and creamy consistency.

Add the prepared fruits and mini marshmallows to the creamy mixture in the bowl. Gently fold the ingredients together using a spatula, ensuring every bite of your Hawaiian Fruit Salad is packed with vibrant fruity flavors.

Cover the mixing bowl with plastic wrap or transfer your Hawaiian Fruit Salad to an airtight container. Place it in the refrigerator to chill for at least one hour, preferably four hours or overnight.

Before serving, give your Hawaiian Fruit Salad a gentle stir to reincorporate any settled ingredients. Spoon it into serving bowls, and enjoy this refreshing dessert cold.