Preheat oven to 375 degrees.
Cream together shortening butter and granulated sugar. Add the molasses and eggs and whip until light and fluffy.
Sift all of your dry ingredients into a large bowl then use a measuring cup to add the dry ingredients about 1 cup at a time.
Separate the dough into three equal pieces, then wrap in plastic wrap and chill for an hour or two.
Roll out on floured parchment paper to about 1/4 an inch thick and cut into desired shapes. Place the cut out cookies into the freezer for ten minutes or so before baking.
Bake at 375° for 6-8 minutes for small cookies, 8-10 minutes for medium, and 10-15 minutes for large. Let cool, then decorate with vanilla royal icing.