Preheat the oven to 350 F. In a medium bowl, whisk together flour, salt, baking soda, cinnamon, ginger, and cloves. In another large bowl, combine butter, both sugars, and molasses until fluffy.
Add in the egg and vanilla extract, and mix until smooth. Add in the flour mixture, mix until it is fully combined. Fold in the m&ms.
Roll the cookie dough into balls, and place at least 2-inches apart onto an ungreased baking sheet. Bake for 10-12 minutes.