Dissolve the Orange Jell-O: Whisk Jell-O and boiling water until dissolved.
Add Cold Water: Stir in ½ cup cold water and let cool slightly.
Chill Slightly: Refrigerate for 15 minutes until syrupy.
Whisk in Pudding: Add pudding mix, whisk until thickened, and chill 15–20 minutes.
Fold in Cool Whip: Gently fold in Cool Whip until fluffy.
Add Oranges and Marshmallows: Fold in fruit and marshmallows.
Chill & Serve: Chill 2+ hours before serving; garnish with oranges or whipped cream.
