1. Preheat oven to 350 degrees.
2. Combine flour, baking soda, salt, and cocoa in mixing bowl.
3. Beat butter, both sugars, and vanilla until creamy.
4. Beat in eggs.
5. Gradually add flour mix.
6. Stir in butterscotch chips.
7. Drop by large tablespoonful onto ungreased cookie sheets.
8. Bake 9-11 minutes, or until slightly set.
9. Cool on cookie sheets another 2 min, than remove to wire racks.