Preheat oven to 350 degrees F, grease an 8x8” baking dish, set aside.

Mix flour, cocoa powder and sea salt together in a small bowl; set aside.

Melt chocolate and butter together in a microwave safe bowl, or on the stovetop over low heat. Stir until smooth and glossy. Set aside.

In the bowl of a standing mixer, beat eggs for 1 minute or until pale and thick.

Add sugar and beat for an additional 30-60 seconds, until sugar is dissolved.

Add melted chocolate/butter mixture and vanilla and stir on low speed until batter is smooth and homogenous (uniform throughout).

Add dry ingredients, mix on low speed until just incorporated and there are no lumps.

Stir in chocolate chips or other mix-ins by hand.

Pour batter into prepared pan; bake until the top is set and the brownies are only very slightly “jiggly”, 25-30 minutes.**

Place brownie pan on a wire cooling rack to cool completely.

Cut into squares and serve.