Combine flour, baking soda, baking powder and salt in a medium bowl; set aside.
Beat butter in the bowl of an electric mixer until softened; beat in sugars until well blended; beat in the eggs, one at a time, blending well after each addition; beat in vanilla, fold in the flour mixture with a spatula.
blend 5 seconds with the mixer on low; the batter will be thick; stir in the oats, raisins and nuts.
Drop by rounded tablespoonful onto ungreased cookie sheets 2 inches apart.
Bake until lightly browned and edges are set, 12-15 minutes.
Cool cookie sheets on a wire cake rack 1-2 minutes; gently remove the cookies from the sheets to the rack; cool completely.