Preheat the oven to 375 degrees F.
With a wooden spoon, mix the sugars together in a large bowl and add the melted butter. Stir vigorously for about a minute or more. Mix the egg and vanilla in the measuring cup you used for the sugar and add to the mixture. Stir until the mix gathers a glossy sheen, about 1 more minute.
Mix in the flour, milk powder, salt, baking powder, and baking soda until just combined. Stir in the chocolate chips and mix until evenly distributed.
Use a #24 squeeze handle scoop to portion the dough (or lightly form into balls about the size of a golf ball) and place on a baking tray lined with parchment paper about 2 to 3 inches apart.
Bake for 9-11 minutes or until golden brown around the edges but still soft in the middle. The cookies will fall as they cool. Transfer to a cooling rack to cool completely.
