Preheat oven to 350°F (175°C) and line two baking sheets with parchment paper.
Whisk together the flour, baking soda, and salt in a medium bowl.
Beat softened butter in a large bowl until fluffy, then gradually add white sugar and cream until airy.
Mix in vanilla bean paste, egg, and egg yolk until fully incorporated.
Gradually blend in the flour mixture on low speed until just combined.
Divide dough into four portions and mix each with passionfruit flakes, grapefruit zest, and freeze-dried raspberries respectively.
Scoop tablespoon-sized dough balls and roll them in sugar.
Place on baking sheets and bake for 8-9 minutes, until edges are set.
While warm, reshape cookies if needed, then cool completely on wire racks.