Add the olive oil to a small saucepan and saute the onion over medium heat for 4-5 minutes. Add the garlic and saute for another minute or two. Remove from heat.
Add the 1/2 cup water to a saucepan and bring to a boil. Add the quinoa, cover, and simmer for about 10 minutes or until all liquid has been absorbed.
Mash the black beans with a potato masher or fork until there are no large chunks left.
In a mixing bowl, combine all ingredients until incorporated. Add more flour if the mix is too wet. You want it to stick together but not be crumbly. Lean towards stickier rather than dry or they won't stay together when cooked.
Using a 1/3 cup scoop, form four large patties and place them on a baking sheet with parchment paper. Moisten the bottom of the scoop to press down for a uniform thickness.
Place the patties in the freezer for about 20-30 minutes. If you are making them ahead of time, you can store them in an airtight container and keep them frozen for up to 3 months. Use parchment paper in between patties so they don't stick.
Heat a skillet over medium heat and add a little oil to coat the pan. Fry the patties for 3-4 minutes per side until browned and crispy.
Enjoy them fresh. Top with cheese, veggies, and sriracha aioli, or on a salad. Keep in an airtight container in the fridge for a day or two. They are best the day they are cooked and do get a little softer the next day.