In the mixing bowl of a stand mixer, place the butter, sugar, brown sugar, egg, and Vanilla, and mix until light and fluffy. In a separate bowl, combine the flour, baking soda, and salt, and whisk together until well mixed. Add the flour mixture to the mixing bowl a little at a time, until well mixed. Remove the mixing bowl from the mixer, and gently fold in the chocolate chips, and butterscotch chips, until well combined.