If you haven't already, cook the quinoa and cauliflower rice according to the package instructions, squeezing any excess moisture out of the cauliflower rice using a cheese cloth or nut milk bag (or a few paper towels); place them into a large mixing bowl.
Make the flax eggs: stir 2 tablespoons flaxseed meal and 5 tablespoons water together in a small bowl, then let the mixture sit for about 10 minutes until the flaxseed absorbs the water.
Next, add the garlic, breadcrumbs, flour, milk, flax eggs, Italian seasoning, parsley, salt, and oregano to that same bowl.
Use a fork to stir and mash everything together.
Wet your hands, then use your hands to form the mixture into 20-24 meatballs; place them on a plate or platter. The mixture will be a little wet, so you'll have to press it together in your hands to form it into meatballs.
Heat oil in a large nonstick skillet over medium heat, then add the meatballs and pan-sear them for 5-8 minutes until they're golden brown on the outside. Be careful when turning them because they're a little fragile! You may need to do this in batches depending on the size of your skillet.
Optional: pour marinara sauce (or sauce of choice) into the skillet and heat it for 1-2 minutes. Remove the skillet from the heat and enjoy!