Preheat your oven to 350°F (175°C) and line your baking sheets with parchment paper.

Cream together the softened unsalted butter and granulated sugar until fluffy, about 3-5 minutes.

Add the egg and mix until fully integrated, resulting in a smooth mixture.

Whisk together all-purpose flour, baking powder, and salt in a separate bowl.

Gradually add the dry mixture to the wet cream, stirring gently until a dough forms.

Divide the dough into portions and knead in the Jello gelatin powder until uniform in color.

Chill the dough balls in the refrigerator for 15-20 minutes to prevent spreading.

Roll the chilled dough into small balls, coat in additional sugar, and flatten slightly before placing on baking sheets.

Bake for 8-10 minutes or until edges are set and tops are crackled.

Let cool on the baking sheet for about 2 minutes before transferring to a wire rack.