Heat oven to 375ºF. In large bowl, beat margarine, brown sugar and 3/4 cup granulated sugar until creamy. Add eggs; beat well. Add combined flour, oats, 1 teaspoon cinnamon, baking soda and salt; mix well.
Drop dough by rounded teaspoonfuls onto ungreased cookie sheets. Sprinkle each cookie lightly with combined remaining 1 tablespoon granulated sugar and remaining 1 teaspoon cinnamon.
Bake 8 to 10 minutes. Cool 1 minute on cookie sheets; remove to wire rack. Cool completely. Store tightly covered.