01 -
Preheat your oven to 200°F (95°C) and line a baking sheet with parchment paper.
02 -
In a clean, grease-free bowl, beat the egg whites on medium speed until they become frothy.
03 -
Add the cream of tartar to the frothy egg whites and continue beating until soft peaks form.
04 -
While mixing on high speed, slowly add the sugar, one tablespoon at a time. Continue beating until the meringue becomes glossy and forms stiff peaks.
05 -
Sprinkle in the Jello powder and vanilla extract, then mix until everything is well combined and the color is uniform.
06 -
Transfer the meringue mixture to a piping bag fitted with a star tip and pipe small mounds onto the parchment-lined baking sheet, spacing them about an inch apart.
07 -
Bake in the preheated oven for 60-90 minutes, until the cookies feel dry to the touch and can be easily lifted from the parchment paper.
08 -
When done baking, turn off the oven and leave the meringues inside with the door slightly open for about an hour to cool slowly.
09 -
Once completely cool, store the meringue cookies in an airtight container at room temperature to keep them crisp and dry.