Preheat your oven to 350°F (175°C) for even baking.
In a large bowl, whisk together the all-purpose flour, bread flour, oats, baking powder, baking soda, and salt.
Cream together the cold butter, brown sugar, and granulated sugar until light and fluffy, about 2-3 minutes.
Add the eggs one at a time, mixing well after each addition, then stir in the vanilla extract.
Gradually add the dry mixture to the wet ingredients, mixing just until combined.
Fold in the chocolate chips, butterscotch chips, and Butterfinger bits until evenly distributed.
Scoop rounded balls of dough onto prepared baking sheets, leaving space between each cookie. Bake for 10-12 minutes.
Allow cookies to cool on baking sheets for a few minutes before transferring to a cooling rack.
