Preheat oven to 375. Combine flour and cinnamon in a small bowl. Beat butter, granulated sugar, brown sugar, eggs and vanilla in a large bowl, gradually adding in the flour mixture. Stir in the oats and butterscotch chips. Drop dough onto a Silpat lined or prepared baking sheet. 

If making larger cookies, bake 9 minutes or until cookies become just golden around the edges. Smaller cookies, 7 to 8 minutes. Cool briefly on the baking sheets before removing to a wire rack.