Preheat oven to 350 degrees. Beat butter, olive oil and brown sugar. Add eggs and beat well.
In a separate bow, combine the flour, flax seed meal, baking soda, and salt. Add the dry mixture to the oil mixture. Mix in oats and chosen add-ins (chocolate chips/ carob chips/ chopped nuts/ raisins/ dried cranberries until well incorporated.
Drop dough by tablespoon onto an ungreased cookie sheet. Bake 8-10 minutes or until golden brown. Cool for 3 minutes and then remove to wire rack to finish cooling.