In a bowl cream together butter, sugar and vanilla until creamy.
Add milk and beat until incorporated.
Add the flour and baking soda and mix to form a smooth and soft dough.
Finally add the choco chips and butterscotch chips and mix well.
Cover with cling wrap and refrigerate for 30 minutes.
Preheat oven to 175°C.
Divide the dough into 12 equal portions.
Shape them into balls and arrange them on the tray leaving 2" in between.
Bake for 12 minutes in the preheated oven.
The cookies will be very soft, but remove them from the oven.
Allow it to cool completely in the tray.
Using a spatula, carefully remove them from the tray and store in air tight box.