Preheat the oven to 350°F (175°C).

Line a baking sheet with parchment paper.

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

Beat in the eggs one at a time, then mix in the vanilla extract until well combined.

In a separate bowl, whisk together the all-purpose flour, baking soda, and salt.

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

Fold in the butterscotch chips gently.

Drop tablespoon-sized balls of dough onto the prepared baking sheet and bake for 10 to 12 minutes, or until the edges are golden. Cool on a wire rack before serving.