Heat treat the flours (DO NOT skip this step): Preheat the oven to 350°F. Spread both flours onto a baking sheet lined with a silicone baking mat and bake for 7 minutes in the oven or until the flour reaches 160F then let it cool.
1 cup all-purpose flour, heat treated, 3/4 cup cake flour, heat treated
In a medium sized mixing bowl, use a hand held mixer to cream together the butter, brown sugar and powdered sugar until creamy and smooth.
8 Tbsp. unsalted butter, softened at room temperature, 3/4 cup dark brown sugar, packed, 1/2 cup powdered sugar
Add in the milk, vanilla and salt and mix again.
3 Tbsp. whole milk, 2 tsp. pure vanilla extract, 1/2 tsp. salt
Gradually add in the heat treated flours until combined.
Fold in the chocolate chips with a silicone spatula until fully incorporated.
1/2 cup mini chocolate chips, 1/2 cup milk chocolate chips (or semi sweet)
Enjoy immediately with a spoon directly into your mouth! :)