In a large bowl, use an electric mixer to blend the softened butter with the brown and white sugars for 3 minutes.
Add the room-temperature egg and vanilla extract and mix again with an electric mixer to incorporate.
Add the flour, sifted with the baking powder, baking soda and sea salt, and mix with a spatula to incorporate.
Add the chocolate chips and mix again with a spatula to incorporate them.
Using a cookie scoop, form balls of cookie dough and place on a baking sheet lined with baking paper. Sprinkle with flaky sea salt and bake in a preheated oven at 350°F for about 15 minutes.
Let the chocolate chip cookies cool slightly and enjoy!