1. In a saucepan over medium heat, bring water and butter to a boil until fully melted.

2. Add the flour all at once and stir vigorously until a dough forms and pulls away from the sides.

3. Remove from heat and let cool for 5 minutes.

4. Beat in the eggs one at a time, mixing until the dough is smooth and glossy.

5. Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.

6. Transfer dough to a piping bag with a round tip. Pipe circles in various sizes to form a tree.

7. Bake for 25–30 minutes or until golden brown and puffed. Let cool completely.

8. In a chilled bowl, whip the heavy cream until it begins to thicken.

9. Add powdered sugar and vanilla, and continue whipping until stiff peaks form.

10. Add green food coloring if desired and gently fold to combine.

11. Slice each puff in half and fill with whipped cream. Replace tops.

12. Stack filled puffs into a Christmas tree shape, largest on bottom to smallest on top.

13. Dust generously with powdered sugar and serve immediately or refrigerate until ready.