Blend butter, sugars, and pumpkin pie spice.
Beat in eggs.
Mix remaining dry ingredients together and add to sugar/egg mixture.
Mix until well-blended.
Stir in 1 c. M&M's
Drop by tablespoon onto lightly greased cookie sheet.
Decorate tops of cookies with remaining M&M's.
Bake at 375 degrees 10 minutes or until golden brown.