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