Preheat your oven to 350°F / 180°C. Line a large baking sheet with parchment paper or a silpat, and brush with olive oil. Set aside.
Combine the ground flax and 1/3 cup water in a small bowl. Set aside for about 10 min while it firms up into a gel.
Place the oats in the bowl of a food processor and process into a flour. Remove the oat flour and place into a large bowl.
Now put 2 cups of the black beans into the food processor, together with the chipotle peppers. Pulse a few times, then run the food processor until they are well combined and the beans have a bit of a paste-like consistency.
Add the remaining 1 cup of black beans, and pulse a few times to combine. You want the beans to be a bit broken up, but still have some texture to them.
Scrape the bean / chipotle mixture into the large bowl with the oat flour, and then add all remaining ingredients together with the gelled flax seed mixture.
Use a wooden spoon or your clean hands to mix everything together until well combined.
Using your hands, form the mixture into 12 patties - wet hands help make this easier.
Place the patties onto the prepared baking sheet, and brush the tops with a bit of olive oil.
Bake for 15 minutes, then remove the tray from the oven and very carefully turn the patties over. Bake for an additional 15 - 20minutes, until they are nicely browned.
Remove from the oven and enjoy them hot!