Preheat oven to 350 degrees. Line cookie sheets with parchment paper. Combine flour, soda and salt; set aside. With an electric mixer, cream shortening, butter and sugars. Stir in pudding mix and vanilla extract. Add eggs and beat well. Gradually, add the flour mixture. Stir in 3/4 cup M&M'S.
Divide dough evenly (about 1 1/2 cups) in 4 small bowls. First bowl, add an additional 1/2 cup of M&M'S (reserve the rest for decorating). Second bowl, add chocolate chips. Third bowl, add vanilla chips. Fourth bowl, add peanut butter chips.
Use a cookie scoop or tablespoon to drop rounded amounts of dough on cookie sheets. Decorate cookies with reserved M&M'S. Bake 10-12 minutes or until lightly browned. Cool 2 minutes on cookie sheets before removing to wire rack. Cool completely. Makes 4 dozen.