In small bowl, combine flour, soda, salt and cinnamon; set aside.
In large bowl, combine butter, sugar, brown sugar, eggs and vanilla; beat until smooth.
Gradually add flour mixture.
Stir in oats and morsels.
Drop by level tablespoonfuls onto ungreased cookie sheets.
Bake at 375 degrees for 7-8 mins for chewy cookies and 9-10 mins for crisper cookies.
Makes about 4 dozen.