Add the softened butter to a large bowl or bowl of a stand mixer with both sugars.
Beat together until smooth, about 30 seconds.
Beat in the egg and vanilla.
Beat in the dry ingredients aside from the chocolate. Be sure to spoon and level the flour, don't scoop from the bag.
Fold in the chocolate chips or chunks.
Add the dough to the fridge for 1 hour.
During the final few minutes, preheat the oven to 350 degrees Fahrenheit.
Use a large cookie scoop (about 2 1/2-3 tablespoons) and scoop the dough into balls.
Press on a few extra chocolate chunks on top. Bake for 12-16 minutes or until just golden brown around the edges.
Remove from the oven and let cool before serving. Sprinkle with salt flakes and enjoy!