Add the butter to a large mixing bowl. Unless it was already at room temperature, add it to the microwave for about 20-30 seconds. You want it to be soft, but not melted. If you press your finger on the top slightly, it should leave an indent, but not completely fall apart.
Once the butter is softened, add all sugars to the bowl with the butter and beat with an electric mixer until fluffy, creamy and well combined.
Beat in the egg and the vanilla.
Add in all of the dry ingredients. Be sure to spoon and level the flour to measure, do not scoop from the bag.
Beat together until combined.
Fold in the chocolate chips. Scoop using 2 tbsp of dough (I used the medium cookie scoop) and form into balls. Place on a baking sheet lined with parchment paper. Place in the fridge to set for 2 hours. (don't skip this!) When you have about 15 minutes left, preheat the oven to 350 degrees Fahrenheit.
Bake for 10-14 minutes, depending on preferred texture. For gooey cookies, take them out when the centers still look slightly undercooked. Be sure to only place one cookie sheet in the oven at a time, with only 5-6 cookies on each sheet as these will spread.
When they come out of the oven, take a round cookie cutter and shuffle it around each cookie to encourage a perfect circle shape. Sprinkle on a few extra chocolate chips when they're still hot.
Once cool, transfer to a wire rack and then an air tight container for 3-5 days.