Preheat the oven to 350°F. Lightly grease a 9" x 13" pan; line the pan with parchment paper if desired.
2
In a large bowl, beat eggs together, then add the mashed avocado and melted butter. It may help to do this in a blender.
3
Add in the remaining ingredients slowly, making sure to mix well until no avocado chunks are seen.
4
Bake the brownies for 30 minutes, until a cake tester or sharp knife poked into the center reveals wet crumbs, but not raw batter. The brownies should feel set on the edges and in the center. Remove them from the oven, and cool completely on a rack.
5
Cover and let sit overnight before cutting and serving; this gives the bran a chance to soften and become "invisible" in your mouth.