Cream butter, oil and sugars. Add eggs and vanilla; beat well.
Combine flour, cream of tartar, baking soda and salt; stir into butter mixture.
Stir in rice cereal, oats, coconut and nuts. Drop by teaspoonful's on ungreased baking sheet, flatten slightly.
Bake at 350 º F. on lower shelf of oven for five minutes. Move to middle of oven and finish baking until lightly browned, about five minutes. Remove from sheets and cool. Makes six dozen crisp cookies.