Preheat oven to 350 F.
If using a stand mixer, cream together the butter and sugar with the paddle attachment for about three to five minutes until light and fluffy. In mixing by hand, use softer butter and beat the butter with a wooden spoon until it is very soft and creamy and easy to stir.
Add the egg and vanilla and mix to combine.
Add the flour, baking soda and salt and mix to combine.
Set aside a few chocolate chunks to press on top of the cookies before they go in the oven, if desired, and then fold the rest into the batter.
Using a 1 ½ tablespoon scoop, place cookies on line cookie sheet. (I used a silicone mat)
Press chocolate chunks into the tops and then bake cookies for 10-12 minutes, until golden around the edges and cooked through.
Let cool for five minutes on wire tray. Serve.