Pour brownie mix into a large mixing bowl and add eggs and olive oil (in place of vegetable oil) following the box directions. (NOTE: I'm using 1:1 chocolate:blood orange olive oil from the Queen Creek Olive Mill. If your box mix calls for 1/3 cup oil, you'll use 1/6 cup Chocolate Olive Oil and 1/6 cup Blood Orange Olive Oil.)
Squeeze enough juice from the blood oranges to equal the amount of water according to the box and mix into batter.
Zest one blood orange into batter.
Bake for roughly 20 minutes or until toothpick comes out clean.
Let cool, cut, and serve.
Optional *add zest to top of brownies as soon as they come out of the oven*
Notes
I'm using 1:1 chocolate:blood orange olive oil from the Queen Creek Olive Mill. If your box mix calls for 1/3 cup oil, you'll use 1/6 cup Chocolate Olive Oil and 1/6 cup Blood Orange Olive Oil.