Beat melted butter and sugars together, then add the egg and vanilla together and continue beating for 1-2 minutes, until creamy and smooth.
In a separate bowl, mix flour, salt, milk powder, cinnamon, and baking soda together until well combined. Dump this mixture into the bowl of wet ingredients and then add the chocolate chips and finely chopped pecans.
Use a rubber spatula to fold the ingredients together until the flour is just combined. Do not over-mix.
Cover and transfer the dough to chill in the fridge for at least an hour, or overnight.
Preheat the oven to 350℉ and grease or line two large cookie sheets. Scoop 1.5 tbsp sized balls of dough using a small cookie dough scoop.
Bake for 11-13 minutes, or until edges are golden and tops are puffed up.
Let the cookies cool for 5-8 minutes on the baking sheets before transferring them to a cooling rack. Enjoy!