Preheat oven to 325 degrees F. In mixing bowl, cream butter and margarine. Add sugars, vanilla, and oil. Beat until smooth. Add egg and beat again until smooth. Add flour, salt, baking soda, and cream of tartar. Add nuts, oats, coconut and Rice Krispies. Fold in until well blended. Cover bowl with waxed paper and refrigerate for an hour. Dough will be stiff enough to handle. Spray cookie sheets lightly. Pinch off small piece about the size of a marble. Flatten with your fingers. (Regular size cookie sheet will hold 24) Bake for 8 to 10 minutes. After taking them out of the oven, leave on the cookie sheets for a few minutes. Cool on racks.
Recipe courtesy of Corinne Thorud