Beat butter with granulated sugar and brown sugar in a large bowl until well blended. Add eggs and vanilla; beat well.
3
Combine flour with baking soda, cinnamon and salt; gradually add to butter mixture, beating until well combined. Stir in oats and butterscotch chips; mix well. Drop by heaping teaspoons onto ungreased baking sheets.
4
Bake for 8 to 10 minutes or until golden brown. Cool slightly; transfer to a rack and cool completely.