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 the egg and vanilla extract until smooth.
Add in the flour mixture, and mix until it is fully combined. Evenly divide the cookie dough into three bowls. Add red food coloring to one bowl and blue to another. Mix 1/3 chocolate chips into each bowl.
In a shallow dish, combine granulated sugar and ground cinnamon. Take a small amount of cookie dough from each dough and roll into balls. Roll in the cinnamon sugar mixture and place onto a large ungreased baking sheet. Bake for 10-12 minutes.
