Preheat oven to 375.
Line a cookie sheet with parchment paper or silpat mat, set side.
In stand mixer add your butter and sugars and mix together until combined.
In small bowl whisk together your egg and vanilla then add to butter mixture and mix for 1 minute.
Add in flour, malted milk powder, salt, baking powder and baking soda and mix until just combined.
Add in your chocolate chips until blended.
Using a large cookie scoop or ice cream scoop place dough on prepared sheet spacing 2 inches apart.
Sprinkle the tops with a little salt and bake for 13-15 minutes until edges are just golden.
Let cool on cookie sheet for a few minutes before transferring to cooling rack to cool completely.
Sprinkle with some more coarse salt while warm.