Yes, you can prepare the choux pastry ahead of time. After making the dough, pipe it onto a baking sheet lined with parchment paper and freeze the unbaked puffs. Once frozen, transfer them to an airtight container or bag and keep them in the freezer for up to a month. When you’re ready to bake, simply place the frozen puffs directly into the preheated oven (no need to defrost), and add a few extra minutes to the baking time.