Sift almond flour, egg white powder, cocoa powder, and powdered sugar together; discard chunks.
Beat egg whites in a mixer until fluffy. Add sugar and beat to stiff peaks.
Fold meringue into dry ingredients until the batter flows enough to form a figure 8.
Pipe batter onto lined trays, tap to remove air bubbles, and let dry for 20 minutes.
Bake at 300°F for 12 minutes. Cool completely before removing from trays.
Melt chocolate chips, dip cookie tops, and decorate with sprinkles and mini marshmallows.
Make frosting by whipping marshmallow cream, butter, vanilla, and powdered sugar. Add heavy cream for consistency.
Pipe frosting on one cookie, top with another, and enjoy!