Preheat your oven to 200°F (93°C) and line a baking sheet with parchment paper.
In a clean mixing bowl, add the egg whites, ensuring there is no yolk or grease in the bowl.
Using an electric mixer or a whisk, beat the egg whites until frothy.
Add the cream of tartar and continue to beat until soft peaks form.
Gradually add the granulated sugar, one tablespoon at a time, while continuing to beat until stiff peaks form and the meringue looks glossy.
Mix in the vanilla extract and, if desired, add food coloring and gently fold it in.
Spoon or pipe the meringue mixture onto the prepared baking sheet in small dollops or shapes, spacing them about an inch apart.
Place the baking sheet in the preheated oven and bake for 60 minutes, or until the meringues are dry to the touch and easily lift off the parchment paper.
Turn off the oven and let the meringue cookies cool inside for an additional hour to further dry out and firm up.