01 -
Preheat the oven to 200°F.
02 -
Prepare a baking sheet with parchment paper and set aside.
03 -
In a mixing bowl, add the egg whites and cream of tartar. Beat with a whisk or hand mixer until frothy.
04 -
Once the egg whites are frothy, slowly add the sugar while mixing with the hand mixer. Add one teaspoon at a time or in a slow continuous pour, mixing as you go.
05 -
Add the vanilla extract and mix at medium-high speed for about 10 minutes until the mixture resembles a soft marshmallow-like meringue that barely holds a stiff peak.
06 -
Split the mixture in half and dye one half with red food dye. Leave the other half white or another variation of red or pink.
07 -
Add each colored meringue mixture into separate piping bags, then place both bags into a third empty piping bag to create a swirl effect.
08 -
Pipe heart-shaped cookies onto the prepared parchment-lined baking sheet. Top with sprinkles.
09 -
Bake the cookies in the oven for 1 hour. Allow them to cool completely after baking.