Pastry cream can be made up to 3 days in advance.
Dough can be made a day in advance. Just transfer to a pastry bag and refrigerate. Puffs can be made 2 days in advance. They're easier to fill when firm, so to re-crisp, bake at 350 degrees F (175 degrees C) for 5 minutes.
Nutrition data for this recipe includes the full amount of dough and caramel. The actual amounts consumed will vary.