Homemade Oatmeal Cookie Mix

For Cookie Mix: In very large bowl or 6-quart Dutch oven, stir together flour, salt and soda. Add sugars, mixing well. Cut in shortening with pastry blender or two knives until well blended. Stir in oats. Store in tightly covered container in refrigerator or cool dry place up to 3 months. For Cookies: Heat oven to 350 °F (175°C). Lightly grease cookie sheet. In medium bowl, combine all ingredients. Mix with spoon or fork about 1 minute to form a stiff dough. Drop by rounded teaspoonfuls onto prepared cookie sheet. Bake about 15 minutes or until light golden brown. Cool 1 minute on cookie sheet; remove to wire cooling rack.