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 until smooth. Add in the flour mixture and mix until it is fully combined.
Divide the cookie dough between three bowls, mix one with purple food coloring, one with yellow and one with green. Fold 1/3 cup chocolate chips into each cookie dough. In a shallow dish, combine granulated sugar and ground cinnamon.
Take a small amount of each cookie dough and roll together into balls. Roll cookies into the cinnamon sugar mixture. Place cookies onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.
