In a large mixing bowl, combine the cake mix, eggs, and vegetable oil. Stir well with a spatula until a thick, smooth dough forms, about 2-3 minutes.

Drop in the Kelly green gel food coloring, starting with 0.25 teaspoons. Mix thoroughly until the color is evenly distributed throughout the dough.

Cover the bowl with plastic wrap and let the dough rest at room temperature for 15-30 minutes.

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

In two separate small bowls, place the granulated sugar and powdered sugar.

Using a 1-tablespoon cookie scoop, portion out the dough and roll each scoop into a ball. First, roll each ball in the granulated sugar, then roll them heavily in powdered sugar.

Place the rolled dough balls on the prepared baking sheets, spacing them about 2 inches apart. Bake for 9-12 minutes.

Allow the cookies to cool on the baking sheet for about 5 minutes before transferring them to a wire rack to cool completely.