In a food processor, process pecans until very fine.
Add chocolate chips and process for about 10-15 seconds more.
Add all other ingredients and process until a dough begins to form.
Press very firmly into a parchment lined pan (I used a pyrex 6x8).
Allow to chill for about 10-15 minutes.
While brownies are chilling, whisk together all ingredients for the icing together until smooth.
Spread icing over the brownies until covered and return to the refrigerator.
Allow to chill for at least another 10-15 minutes before serving.
Allow brownies to sit out for about 5-10 minutes before cutting.
Sprinkle with sea salt if desired.