Preheat the oven to 350 F. In a medium bowl, whisk together flour, salt, and baking soda. In a large bowl, mix together butter and sugar until fluffy. Add in egg and vanilla extract and mix until smooth. Add in the flour mixture and mix until it is fully combined.
Divide the cookie dough into three bowls. Mix one with purple food coloring, one with orange, and one with green. Fold 1/3 cup chocolate chips into each cookie dough.
Take a small amount of each cookie dough from each bowl, and roll together into balls. Place onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.
