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

In a large mixing bowl, cream together 1 cup of softened unsalted butter and 1 cup of granulated sugar for about 3-5 minutes until light and fluffy.

Add a large egg and mix on low speed until fully incorporated.

Whisk together 2 ½ cups of all-purpose flour, 2 teaspoons of baking powder, and ½ teaspoon of salt in a separate bowl.

Gradually incorporate the dry mixture into the wet mixture until just combined.

Divide the dough into 3-4 equal portions and mix in 1-2 tablespoons of your favorite Jello powder.

Wrap the dough portions in plastic wrap and chill in the refrigerator for about 15-20 minutes.

Remove the dough, roll tablespoon-sized portions into balls, and roll each in ¼ cup granulated sugar.

Place on prepared baking sheets and flatten slightly, spacing them about 2 inches apart.

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

Cool on baking sheets for 2 minutes before transferring to a wire rack.