Place all dry ingredients in a medium bowl and whisk with fork to combine well. In a mixing bowl, place butter and sugars and beat until smooth. Add the egg and vanilla, mixing until well combined- scrape bottom of bowl if needed. Add the dry ingredients and mix until JUST combined. Add the chocolate chunks and coconut flakes and mix until combined. While mixer is going add the whole milk and mix briefly. Using spatula, scrape bottom of bowl to insure everything is well incorporated.