Preheat oven to 350.

In a large bowl using an electric mixer, cream together the butter, sugars, and vanilla extract until well mixed and fluffy.

Add eggs and mix until well combined.

In a medium bowl, whisk together the dry ingredients.

With mixer running on a low speed, slowly add the dry ingredients to the wet ingredients and beat until just incorporated, then fold in the butterscotch chips.

Bake cookies for 12 minutes or until slightly golden around the edges.