to begin make the rice and sauté the onion and garlic over medium low heat until the onions become translucent. Now add the mushrooms and a pinch of salt to draw out the moisture. Cook this until most of the moisture has evaporated.
Now drain the chickpeas and add everything apart from the chickpea flour to a food processor, you want to add that at the end. pulse a few times until everything's well combined and broken down a bit, but not to mushy.
Add the mixture to a bowl and taste a bit of the mixture to see if you want to adjust it to your own taste. Now add the chickpea flour and and mix it all together. Once everything's combined you can put a little bit of oil on your hands and take some of the mixture to form patties.
Now you can pan fry these patties or bake them in the oven.
For pan fried patties you warm up a pan with some oil to a high heat and once the oil gets hot you add the burger patties to the pan. Once the patties are in the pan put the heat to medium/low and cook each side for a couple of minutes.
To bake the burgers you need the preheat the oven to 175 degrees and bake them for about 12 minutes or longer or shorter depending on your oven. To see if they're done check is they're firm and a bit crisp on the outside.