1. Preheat the oven to 200°F and line two baking sheets with parchment paper.

2. Add egg whites, cream of tartar, and salt to a clean mixing bowl. Beat until foamy.

3. Gradually add the sugar, a little at a time, while beating until the meringue becomes glossy and forms stiff peaks.

4. Mix in vanilla extract, peppermint extract, and green gel food coloring until evenly combined.

5. Transfer the meringue to a piping bag fitted with a large star tip.

6. Pipe stacked stars onto the parchment paper to create Christmas tree shapes.

7. Decorate with sparkling sugar, gold sprinkles, pearl sprinkles, or small festive toppers.

8. Bake for 90 minutes, then turn off the oven and let the meringues cool inside with the door slightly cracked.

9. Once fully cool, remove from the parchment and serve or store in an airtight container.