Step 1

Using a medium-sized heat-safe bowl, stir together the orange-flavored gelatin and boiling water. Stir until the gelatin is completely dissolved.

Step 2

Stir in the cold water. Place in the refrigerator for 15 minutes.

Step 3

Remove the cooled gelatin from the refrigerator, and whisk in the instant vanilla pudding until completely incorporated. Cover the bowl and return to the refrigerator for 20 minutes.

Step 4

Remove the bowl from the refrigerator. Fold in the whipped topping, drained mandarin oranges and mini marshmallows. Return to the refrigerator and chill for 2 hours or overnight.

Step 5

Just before serving, garnish with the reserved mandarin oranges and mini marshmallows.