1. In a medium bowl, cream together butter, white sugar, and brown sugar. Beat in eggs one at a time, then stir in vanilla. Combine flour, baking soda, salt, and cinnamon; stir into the creamed mixture. Mix in oats. Add a cup of raisins or nuts if you desire. Cover, and chill dough for at least one hour.
2. Preheat the oven to 190°C (375°F). Grease cookie sheets. Roll the dough into walnut sized balls, and place 2 inches apart on cookie sheets. Flatten each cookie with a large fork dipped in sugar.
3. Bake for 8 to 10 minutes in preheated oven. Allow cookies to cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.