Heat oven to 375f. Grease cookie sheet. In large bowl, beat together butter, brown sugar and 3/4 cup granulated sugar until light and fluffy. Add eggs; mix well. In medium bowl, combine flour, oats, 1t cinnamon, soda and salt. Add to sugar mixture; mix well. Drop by rounded teaspoonfuls onto prepared cookie sheet. In small bowl, combine remaining 1 T sugar and 1 t cinnamon; sprinkle lightly over each cookie. Bake 8-10 minutes. Cool 1 minute on cookie sheet; remove to wire cooling rack.