Cream the butter and sugars

• Beat the softened butter with the brown sugar and granulated sugar until light and fluffy.
• Scrape down the bowl as needed.

Add eggs and vanilla

• Beat in the eggs one at a time.
• Add the vanilla extract and mix until fully incorporated.

Mix the dry ingredients

• Whisk together the flour, baking soda, baking powder and fine salt in a bowl.

Combine into a dough

• Add the dry ingredients to the butter mixture and mix on low speed until just combined.
• Fold in the chopped chocolate chunks by hand.

Chill the dough

• Cover the dough and refrigerate until firm.

Shape the cookies

• Preheat the oven to 180 °C.
• Scoop the dough into balls and place them on a lined baking tray, spaced apart.

Bake

• Bake until the edges are golden but the centers are still soft.
• Sprinkle the cookies with flaky sea salt while still hot.

Cool

• Let the cookies rest on the tray briefly, then transfer to a cooling rack.