Preheat the oven to 350 degrees and prepare a large baking sheet with parchment paper.
In a large mixing bowl, combine sugar cookie mix, butter, cream cheese and egg.
Using an electric stand or hand mixer, combine until the dough is formed. It will be crumbly.
Separate the bowl into 4 smaller bowls (like cereal bowls). Add 3 Tablespoons of Jello powder to each of the bowls.
Using your hands, rub the powder into the dough, pinching and combining until smooth. The color will blend into the dough, dying it evenly.
Use a cookie scoop to compact and scoop the dough from the bowls. Round into smooth balls in between the palms of your hands and place on the baking sheet.
Be sure to place the cookie dough 2 inches apart from one another. You will likely cook 2 sheets.
Bake cookies for 10-11 minutes.
When done, allow the cookies to cool on the baking sheet for 2 minutes before transferring to a cooling rack. Serve warm or at room temperature.