Preheat the Oven: Set your oven to 225°F (110°C). Line a baking sheet with parchment paper.

Whip the Egg Whites: In a clean, dry bowl, whisk the egg whites until stiff peaks form. Gradually add the sugar, one tablespoon at a time, beating well after each addition until the mixture becomes glossy and smooth.

Add Flavor and Color: Gently fold in the vanilla extract. Divide the meringue into separate bowls and mix in red and green food coloring as desired.

Pipe the Kisses: Transfer the colored meringues into piping bags fitted with a star or round tip. Pipe small kiss shapes onto the prepared baking sheet.

Bake: Bake the meringues for 1 hour, or until they are dry and crisp to the touch. Turn off the oven and let the meringues cool inside with the door slightly ajar.

Serve: Once cooled, enjoy these festive treats or store them in an airtight container for up to a week.