First, decide if you'd like to bake the meatballs in the oven or cook them stovetop in a frying pan. If baking in the oven, preheat your oven to 350°F/177°C.
Next, combine the water and ground flaxseed in a small bowl and set it aside.
Then, mash your beans in a mixing bowl using a potato masher.
Add the spices, salt, pepper, tomato paste, and the flax/water mixture to the bowl containing the mashed beans and stir very well until the tomato paste is evenly distributed throughout.
Next, add the cooled quinoa and the oatmeal to that bowl and stir well again.
Lastly, form this mixture into 11 to 12 equal-sized balls and either place on a lightly oiled frying pan over medium-high and allow them to cook for five minutes on each side until browned all over. Or, place them on a baking sheet and bake in a pre-heated oven for 30 minutes. You can't go wrong either way!
Once they're cooked, decide how you'd like to eat them; you can go the traditional route and pile them on top of a plate of pasta with marinara sauce, or just dip them in a sweeter sauce, such as ketchup! Feel free to get creative.