Heat oven to 350 F. in large bowl, beat butter and sugars until creamy. Add eggs and vanilla; beat well. Add combined flour, baking soda, cinnamon and salt; mix well. Add oats and chocolate chips; mix well.
Drop dough by rounded tablespoonfuls onto ungreased cookie sheets.
Bake 10 to 12 minutes or until light golden brown. Cool 1 minute on cookie sheets; remove to wire rack. Cool completely. store tightly covered.