Preheat oven to 350 degrees.
In a mixing bowl, cream together softened butter and sugar.
Add in eggs one at a time, beating in between each egg.
Add in brown sugar, mix well. Add in vanilla and mix.
In a separate bowl, mix together flour, baking powder, baking soda, and salt. Slowly add the dry ingredients into the wet ingredients while mixing on low.
Fold in the mini chocolate chips and Butterfinger baking chips.
Scoop the cookie dough onto a baking sheet. Scoop about 3 tablespoon at a time. Bake for 20-22 minutes.
Remove cookies from the baking sheet and place on a cooling rack. Serve when cooled.