Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

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

In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy, about 2-3 minutes.

Add the vanilla extract and eggs, one at a time, mixing well after each addition.

Gradually add the dry ingredients to the wet mixture, mixing until just combined.

Fold in the butterscotch chips and semi-sweet chocolate chips until evenly distributed.

Drop rounded tablespoons of dough onto the prepared baking sheet, leaving space between each cookie.

Sprinkle a pinch of flaky sea salt on top of each cookie dough ball.

Bake for 10-12 minutes, or until the edges are golden brown but the centers are still soft.

Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.