To prepare a special butterscotch chip cookies in jar recipe, first you need to prepare the ingredients. First, you will need butter, sugar, flour, baking powder, salt, and vanilla extract. Then, add the butter mixture to the dry ingredients and mix until combined. Next, pour the batter into the prepared baking pan and bake for 12 to 15 minutes or until the cookies are lightly browned. Remove from the oven and allow to cool for 5 minutes before serving.