Preheat the oven to 175*C.

Line an 8x8-inch baking pan with foil.

Spray with cooking spray or grease foil.

Combine the chocolate chips and butter into a large microwave safe bowl.

Heat in the microwave for 1 minute then stir.

Continue heating in 30-second bursts.

Stirring between each burst, until mixture is melted and smooth.

Please be careful not to scorch it.

Let cool slightly.

In a large mixing bowl, beat eggs and sugar until light and thick.

Add in the vanilla extract, and beat.

Stir in the cooled chocolate mixture with a rubber spatula.

Then gently fold in flour until combined.

Pour the batter into the prepared baking pan.

Sprinkle a little sea salt flakes on the top of the batter.

Do not over salt it!

Bake 35 minutes or until skewers has a few moist crumbs when inserted.

Do not over-bake.

Let cool to room temperature before slicing.

Sprinkle a touch more sea salt of desired.