Preheat oven to 190 degrees celsius.

Cream together butter and sugar. Beat in eggs and vanilla.

Combine flour, baking soda, salt, cinnamon. Stir into the creamed mixture and mix in oats.

Roll the dough into one inch balls and place on a greased baking sheet, 2 inches apart. Flatten each ball with the back of a fork.

Chill dour for at least one hour.

Bake at 190 degrees celsius for 8-10 minutes.

Remove from the oven, and allow the cookies to cool on the sheet for around 10 minutes. Transfer to a wire rack to cool completely.