Preheat oven to 350ºF.
In a small bowl, prepare one flax egg and set aside (1 tbsp flax + 3 tbsp hot water).
In a medium-sized bowl using a hand mixer, blend the butter, brown sugar, and white sugar until smooth and well combined.
Add in flax egg, vanilla, salt and baking soda and mix again with a hand mixer to combine.
Add in flour (use the spoon and level method to mix your flour!) and mix with your hand mixer or spatula until flour is thoroughly mixed into the dough. Once combined, fold in the chocolate chips.
Leave cookie dough in a bowl and cover with plastic wrap or a lid and let chill in the fridge for 30 minutes - 1 hour. You may skip this step if you don't have time to chill the dough!
Once your cookies have chilled, line a baking tray with parchment paper and use a cookie scooper to place cookies on the tray, about 2 inches apart from each other.
Top with a few more chocolate chips and place in the oven for 10-12 minutes, or until edges begin to brown slightly.
Once they are done cooking, remove from the oven and let cool in the tray for about 2-3 minutes. Cookies will look slightly raw but still need to set!
Once cookies have set, let cool for another 10 minutes, then lightly sprinkle with flaky salt. Once cookies are not too hot, transfer to an airtight container or enjoy right away!