1. Preheat the oven to 200°F (93°C) and line two baking sheets with parchment paper. Fit a piping bag with a large star tip.

2. In a clean, dry bowl, add egg whites and cream of tartar. Beat on medium speed until soft peaks form.

3. With the mixer on high, gradually add sugar one tablespoon at a time. Beat until stiff, glossy peaks form and sugar is dissolved.

4. Add vanilla extract and green food coloring. Beat until color is fully mixed in.

5. Transfer mixture to piping bag and pipe tall swirls onto baking sheets, spacing them slightly apart.

6. Decorate tops with sprinkles or edible stars.

7. Bake for 1.5 hours. Turn off oven and let meringues sit inside for 1 additional hour.

8. Once fully cooled, store in an airtight container at room temperature.