Step 1: Dissolve the Orange Gelatin 🍊

Place the 3-ounce box of orange gelatin in a large mixing bowl.

Pour 1 cup boiling water over the gelatin.

Whisk continuously for approximately 1 to 2 minutes, or until the gelatin has completely dissolved.

Take your time with this step.

Undissolved gelatin granules can create an unpleasant texture later.

Step 2: Add the Cold Water

Pour 1/2 cup cold water into the dissolved gelatin.

Stir until evenly combined.

Allow the mixture to stand for approximately 5 minutes so it begins cooling.

You don’t want the gelatin mixture extremely hot when the milk and pudding are added.

Step 3: Add the Milk and Vanilla Pudding 🍦

Pour in 1 cup cold milk.

Add the 3.4-ounce package of instant vanilla pudding mix.

Whisk until the mixture becomes smooth and begins to thicken slightly.

Make sure there are no obvious pockets of dry pudding mix remaining.

Step 4: Add the Vanilla

Stir in 1 teaspoon vanilla extract.

This small addition helps reinforce the creamy vanilla flavor that gives the dessert its creamsicle character.

Step 5: Chill Briefly

Transfer the bowl to the refrigerator for approximately 15 to 20 minutes.

You want the mixture to begin thickening without allowing it to become completely firm.

Check it near the 15-minute mark.

It should look thicker than when it entered the refrigerator but still be soft enough to fold with the whipped topping.

Step 6: Fold in the Whipped Topping

Remove the partially thickened orange mixture from the refrigerator.

Add 8 ounces thawed whipped topping.

Using a rubber spatula, gently fold the whipped topping into the orange mixture.

Continue folding until the dessert is:

• Light
• Creamy
• Fluffy
• Evenly orange
• Free of large white streaks

Avoid aggressively stirring or beating at this stage because gentle folding helps maintain the airy texture.

Step 7: Add the Mandarin Oranges 🍊

Make sure the 15-ounce can of mandarin oranges has been thoroughly drained.

If necessary, allow the oranges to sit in a strainer for several minutes.

Gently fold them into the fluff.

Reserve a few attractive orange segments for decorating the finished dessert if desired.

Step 8: Add the Mini Marshmallows

If using them, gently fold in 1/2 cup mini marshmallows.

Don’t overmix.

You only need to distribute them throughout the dessert.

Step 9: Chill Until Set ❄️

Cover the bowl tightly.

Refrigerate the Orange Creamsicle Fluff for at least 2 hours.

This longer chilling period allows:

• The gelatin to finish setting
• The pudding to thicken
• The flavors to blend
• The fluff to become scoopable
• The mandarin oranges to become incorporated into the creamy base

For a make-ahead dessert, you can prepare it several hours before serving.

Step 10: Garnish and Serve

Give the chilled fluff a gentle stir if necessary.

Spoon it into individual dessert cups or serve directly from a large bowl.

Garnish with reserved mandarin oranges, additional whipped topping, mini marshmallows, or a little fresh orange zest if desired.

Serve cold.