Pre-heat the oven to 175℃ (350℉). Line a large baking tray.
Melt the butter carefully in the microwave. The butter should be almost melted, but there will still be some lumps (it should not be hot).
Whisk the butter and sugar together (just until everything is combined).
Add the vanilla and milk, and once more, whisk until everything is evenly distributed.
Mix the flour and baking soda together.
Add to the wet ingredients, and using a spatula or wooden spoon, just mix until everything pulls together (the dough will be sticky at this stage).
Add your chocolate chunks and stir in.
Using your hands, form the dough into 6 balls (see note 3), and place on the prepared tray with some space in between.
Bake for 10 minutes for a very soft cookie, or a couple of minutes longer if you prefer a firmer middle.
Allow to cool on the tray for a while until they firm up a bit. The cookies will be very soft and break easily when hot. Enjoy while still soft and warm.