These light and airy espresso chocolate meringue cookies are the perfect treat to bake! With simple ingredients, they're truly customizable but look like they took a lot of work to make!
Whisk together superfine sugar and cornstarch in a small bowl to combine.
¾ cup superfine sugar, 1 tbsp cornstarch
In the bowl of an electric mixer, whip egg whites on medium-low with cream of tartar until light and frothy.
3 large egg whites, ¼ tsp cream of tartar
Slowly add sugar and cornstarch mixture to egg whites with mixer running, one tablespoon at a time. Increase the mixer to medium-high until stiff peaks and the whites become shiny and glossy in texture.
Add espresso powder and cocoa and mix to incorporate. You may need to fold a few times by hand to ensure the cocoa is fully mixed in.
Pipe or dollop with spoons onto parchment-lined baking sheets, making sure to create small and flat cookies. Large puffy cookies will bake more hollow and be hard to eat. Top with shaved chocolate (optional).
Bake in a preheated 300°F oven for 30-60 minutes, depending on the size and shape of the cookies.
Once dry to the touch, pull out of the oven and let cool on baking sheets for 20 minutes.
Spread Nutella on the back of one cookie and sandwich with another.