Prepare the Meringue:

1. Preheat the Oven:
   • Preheat your oven to 200°F (95°C). Line a baking sheet with parchment paper or a silicone baking mat.
2. Beat the Egg Whites:
   • In a clean, grease-free bowl, beat the egg whites and cream of tartar on medium speed until soft peaks form.
3. Add Sugar Gradually:
   • Increase the mixer speed to high and gradually add the sugar, 1 tablespoon at a time, beating well after each addition. Continue beating until stiff, glossy peaks form (about 5-7 minutes).
4. Add Flavor and Color:
   • Beat in the vanilla extract and a few drops of green gel food coloring until the desired shade is achieved.

Shape the Trees:

5. Pipe the Meringue:
   • Transfer the meringue to a piping bag fitted with a large star tip. Pipe small spirals onto the prepared baking sheet to form tree shapes, starting from the base and building up to a point.
6. Decorate:
   • Add star sprinkles to the top of each tree and decorate with assorted sprinkles as ornaments.

Bake the Meringues:

7. Bake:
   • Bake the meringues for 1.5-2 hours, or until they are dry and easily lift off the parchment paper. Turn off the oven and let the meringues cool completely in the oven to prevent cracking.

Serve or Store:

8. Enjoy:
   • Serve immediately or store in an airtight container at room temperature for up to 1 week.