Preheat oven to 35Prepare baking sheets with parchment paper or baking spray.
Cream shortening and sugars for 2-3 minutes, until light and fluffy.
Add eggs and vanilla, and cream until very light, scraping the bowl as necessary.
Add flour, baking soda and salt, and mix until combined. Stir 2 cups of M&Ms.
Drop by 2 tbsp sized balls onto cookie sheet. Press 2-3 more M&Ms into the tops of the cookies.
Bake for 12-14 minutes, or until cookies don't appear wet on top and edges are beginning to brown.
Cool for 5 minutes on baking sheets, and remove to wire rack to cool completely.