In a large mixer, combine the softened butter and brown sugar with a paddle attachment. Let combine for 3 minutes. Add the eggs one at a time, followed by the vanilla extract. Add the flour, baking soda, sea salt and baking powder and slowly combine, making sure not to over mix the batter. Add the oats and chocolate chips and combine. Refrigerate batter for at least 1 hour.
Preheat the oven to 350 degrees. Line 2 baking sheets with parchment paper and set aside.
Using a 2 tablespoon scoop, scoop 12 cookies onto each parchment lined baking sheet and dust with a few maldon sea salt flakes. Transfer sheets into the oven and bake for 10-12 minutes. At the 6 minute mark, take the pan out and bang it to deflate the cookies, and then transfer back to the oven and bake until the cookies just slightly turn a golden brown color on the edges but are still soft and chewy in the middle. Remove from the oven, transfer to the cooling rack. Repeat process for remaining dough
Cool the cookies completely before packing up and storing in an air-tight container.
Notes
Store in an airtight container in the fridge for up to 1 week or for months in the freezer.