In a large bowl, whisk together flour, baking soda, and salt. Set aside.

Using a mixer, cream together butter, brown sugar, and granulated sugar until well combined.

Add eggs and vanilla extract, mixing after each until fully incorporated. Scrape the bowl as needed.

Gradually blend in the dry ingredients until just combined, then stir in butterscotch chips.

Cover dough and chill in the refrigerator for at least 2 hours.

Preheat oven to 350°F and line baking sheets with parchment paper.

Scoop chilled dough onto baking sheets, spaced apart.

Bake for 10 to 12 minutes until edges are lightly browned. Cool on sheets for 5 minutes, then move to wire rack.