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 together until smooth.
Add in the egg and vanilla extract and mix until smooth. Add in the flour mixture, and mix until it is fully combined. Divide the cookie dough between three bowls.
Add red food coloring to one bowl, and blue to another. Mix 1/3 chocolate chips into each bowl. Take a small amount of 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.
