Preheat the oven to 325 F / 165 C.
In a bowl, mix all of the dry ingredients together.
Add all of the wet ingredients. Mix until almost combined, but not quite.
Add the chocolate chips and walnuts. Mix until combined.
Line a baking sheet with parchment paper. Scoop 6 3-tbsp balls of cookie dough to put on each tray.
Bake at 325 F / 165 C for 15 minutes. If desired, sprinkle with flaky sea salt when freshly out of the oven.
Leave the cookies to rest on the tray for at least 5 minutes as they flatten slightly after baking.
Enjoy!