In a large mixing bowl, add the flour, baking soda, salt, cocoa powder, and malted milk powder. Whisk together.
In another mixing bowl, add the butter, brown sugar, and sugar, cream together using an electric mixer until fluffy. Add the eggs and vanilla, mix with electric mixer until fully incorporated.
Now use a sturdy spoon and add the flour mixture to the butter mixture and mix until combined, repeat until all the flour mixture is mixed in. The dough will be stiff.
Add the chocolate chips and mix those in.
Cover the bowl with plastic wrap and place in the fridge for at least 1 hour or even overnight. (I chilled it for an hour then proceeded with cooking them.)
When you are ready to bake, preheat your oven to 180 C (350 F) and line baking sheets with parchment paper.
Spoon dough by rounded tablespoons onto the prepared baking sheets. Bake for 10 minutes or until set.
Remove from oven and let cool on sheet for 5 minutes.
Then remove to a wire rack to cool completely.
Serve and enjoy.