In a large skillet, bring 2 tablespoons of oil to medium heat. Add onion and saute 5 minutes until soft and translucent. Add garlic and mushrooms. Saute 5-8 minutes until the mushrooms are tender (don’t overcook to the point where they’re soggy!) Remove from heat and allow to cool.
Preheat the oven to 400ºF and line a baking sheet with parchment.
Add the quinoa and the mushroom + onion + garlic mixture to a food processor. Pulse until well combined. The mixture should resemble a rough paste. Empty into a bowl.
Add oat flour, remaining ¼ cup of quinoa, Italian herb seasoning, red pepper flakes, nutritional yeast, tamari, salt, and pepper. Stir to combine.
Create your meatballs! Scoop the mixture out 1 tablespoon at a time, then roll into balls and place onto the baking sheet. Bake 25-30 minutes, then serve as desired!