ADD INS: cinnamon chips + toffee chips OR chocolate chips + nuts OR raisins
Preheat the oven to 350°F. Line baking sheets with parchment paper or silpat mats.
In a large bowl, use an electric mixer to combine the brown sugar, butter and shortening. Add the eggs and beat until the mixture is light in color, and then mix in the buttermilk.
In a separate bowl, sift together the flour, baking soda, baking powder and spices.
Stir the dry ingredients into the wet ingredients. Fold in the oats and vanilla. Add in whatever add-in you'd like, or separate the batter into three bowls and create three different loaded cookie doughs.
Drop by heaping teaspoonfuls, 2 inches apart, onto cookie sheets. I like to add more chips or raisins or whatever you're using on top of the cookie dough because that will make the cookies prettier once they are baked. Bake until lightly browned, 12 to 15 minutes.
NOTE: Nutritional information is for the oatmeal cookies. Any ADD-INS should be counted as extra calories, etc.