01 -
Preheat the oven to 150°C. Line two baking trays with parchment paper and set aside.
02 -
Heat a small saucepan of water until steaming. In the bowl of a stand mixer, combine egg whites and granulated sugar. Set over the saucepan to form a double boiler.
03 -
Whisk continuously until sugar is dissolved and egg whites are white and frothy, about 1 to 1.5 minutes. Remove from heat and attach the bowl to the stand mixer.
04 -
Using the whisk attachment, whip on high speed for 2–3 minutes until stiff peaks form.
05 -
Sift almond flour, cocoa powder, and powdered sugar together. Add to the whipped meringue.
06 -
Mix lightly at medium speed for about 10 seconds, then use a spatula to fold the batter gently and test for a 'figure eight' consistency. Continue folding until it flows like slow-moving lava.
07 -
Transfer batter into a large pastry bag fitted with a 2.5 cm round tip. Pipe rounds approximately 4 cm in diameter onto prepared trays, spacing 4 cm apart. Tap trays twice on the counter to release air bubbles.
08 -
Bake for 13 minutes, rotating trays halfway through. Cool completely before removing shells from parchment paper.
09 -
Beat peanut butter and softened butter until smooth. Gradually add powdered sugar, vanilla extract, and salt. Whip until fluffy and well combined.
10 -
Transfer filling to a piping bag fitted with a star tip. Pipe filling onto half of the shells, then gently sandwich with remaining shells. Decorate with melted chocolate or chopped peanuts if desired.