In a large bowl, soak pieces of bread in milk until soggy, about 3 minutes.
Add in remaining meatball ingredients and stir together until well combined, being careful not to overwork the meat.
Using a cookie scoop, divide the mixture into approximately 24 meatballs. Roll each individual meatball to be evenly round.
Heat large skillet over medium-high heat. Place meatballs into hot pan and brown on all sides.
While meatballs are cooking, measure all ingredients for the sauce and whisk to combine in a small bowl. Set aside.
Once meatballs are brown (not fully cooked through), remove from pan and deglaze with the sauce, scraping the bottom of the pan to get all of those delicious brown bits.
Place meatballs back into skillet and coat in sauce.
Cover and cook for about 30 minutes.
Garnish with green onion and serve as is as an appetizer or over pasta or rice for a main dish.