Preheat the oven to 350 F. In a medium bowl, whisk together flour, salt, and baking soda. In a large bowl, mix butter and sugar together until fluffy. Add in the egg and mint extract.
Add in the flour mixture, mix until it is fully combined. Fold in the crushed mint Oreo cookies.
Roll the cookie dough into balls and place onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.