2 c flour
1 t baking soda
¼ t salt
1-1/4 c butter, room temperature
1 c sugar
¾ c dark brown sugar
2 eggs
1 t vanilla
1 c butterscotch chips
1 c semisweet chips

Preheat oven to 350. Line two baking sheets with parchment paper and set aside. Whisk flour, baking soda and salt in medium bowl and set aside.
In electric mixer with paddle attachment, cream butter and sugars until light and fluffy, about 3 minutes. Add eggs and vanilla; beat until well combined. Add the flour mixture all at once and beat until just combined. Stir in chips.
Drop tablespoons of batter onto prepared baking sheets, 2 inches apart. Bake until golden brown, about 12 minutes. Transfer to wire rack on baking sheet for 1 minute, then to wire racks to cool slightly.