Preheat the oven to 350 F. In a medium bowl, whisk flour, salt, and baking soda together. In a large bowl, mix butter with 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 between three bowls. Mix one with green food coloring, one with purple food coloring, and one with orange.
Fold 1/3 cup white chocolate chips into each cookie dough. Take a small amount of each cookie dough and roll into balls. Place onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.
