Prepare chia egg (mix 1 tbsp of chia with 3 tbsp of water)
In a food processor, pulse onions, bell pepper, chipotle pepper and cilantro until they are broken down into smaller chunks.
Add in black beans, oats, chia egg, spices and a pinch of salt. Let run on low for a couple of minutes until well blended. You may need to scrape down the sides.
Form into four patties on a parchment lined baking tray.
Let chill in the fridge for 30 mins.
Preheat oven to 400 and bake for 20 minutes flipping half way.