Combine all meatball ingredients in a large bowl and use your hands to mix until evenly combined. Form into about 1 tablespoon size meatballs, about 32 meatballs.
Heat 1 teaspoon avocado oil in a large non-stick pan. Add the onions and bell peppers and cook over high heat until lightly charred in spots and the onions are soft and translucent, stirring occasionally to allow for browning, about 8-10 minutes. Transfer to a bowl and set aside, do not clean the pan.
Add the remaining teaspoon of avocado oil. When the oil is hot, add the meatballs. Cook until golden, turning occasionally until browned on all sides, about 10-15 minutes. Add back the vegetables and toss to combine.