1 C butter, softened 1 C white sugar 1 C brown sugar 2 eggs 1 teaspoon vanilla extract 2 C all purpose flour 1 teaspoon baking soda 1 teaspoon salt 1 1/2 teaspoons ground cinnamon 3 C quick cooking oats

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. Cover, and chill dough for at least one hour.
Preheat oven to 375 degrees. 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.
Bake for 8-10 minutes in preheated oven. Allow cookies to cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.