Follow these simple steps to create your own Chocolate Meringue Cookies:

1. Preheat Oven: Preheat your oven to 300°F (150°C). Line a baking sheet with parchment paper.
2. Whip Egg Whites: In a clean mixing bowl, add the egg whites and cream of tartar. Beat with an electric mixer on medium speed until soft peaks form.
3. Add Sugar Gradually: Gradually add the granulated sugar, one tablespoon at a time, while continuing to beat the egg whites. Beat until the mixture is glossy and stiff peaks form.
4. Incorporate Cocoa and Vanilla: Sift the cocoa powder and add it to the meringue mixture. Then, gently fold in the vanilla extract, being careful not to deflate the egg whites.
5. Add Chocolate Chips: If using, fold in the semi-sweet chocolate chips for added richness.
6. Pipe Cookies: Using a piping bag or a spoon, dollop small mounds of the meringue mixture onto the prepared baking sheet, leaving space between each cookie.
7. Bake: Place the baking sheet in the preheated oven and bake for about 1 hour or until the cookies are dry to the touch and can be easily lifted off the parchment paper.
8. Cool: Once baked, turn off the oven and leave the cookies inside to cool for 30 minutes. This helps them firm up and prevents cracking.
9. Store: Once cooled, store the cookies in an airtight container to maintain their texture.

These steps will guide you through creating Chocolate Meringue Cookies that are both delicious and aesthetically pleasing.