01 -
Set oven to 175°C (350°F) and allow to fully preheat before baking.
02 -
Line two baking sheets with parchment paper or silicone baking mats to prevent sticking.
03 -
In a large bowl, beat softened butter and granulated sugar using an electric mixer on medium speed for 3–4 minutes until pale and aerated.
04 -
Add egg and vanilla extract to the creamed mixture. Beat until homogenous, scraping down sides as needed.
05 -
In a separate bowl, whisk together flour, baking soda, baking powder, and salt. Ensure even distribution of leavening agents.
06 -
Gradually add dry ingredients into wet mixture, mixing on low just until a uniform dough forms. Avoid overmixing.
07 -
Separate dough evenly into four portions. To each, add one flavour of Jello powder, kneading gently until colour is vivid and distributed.
08 -
Scoop tablespoon-sized pieces of each coloured dough, roll into smooth balls.
09 -
Roll each dough ball in granulated sugar until fully coated, ensuring an even exterior.
10 -
Space sugar-coated balls at least 5 cm apart on prepared trays to allow for spreading.
11 -
Bake cookies for 8–10 minutes until edges are just set, centres should remain soft and slightly underdone.
12 -
Allow cookies to cool for 5 minutes on the sheets before transferring to a wire rack to cool completely.