Combine all ingredients in a bowl and mix to combine
(I recommend mixing with your hands.) Take care not to overmix, or the meatballs will become tough.
Add the remaining olive oil to the pot without cleaning, just scraping up the brown bits. Add the onion to the pot and saute until softened, about 3-4 mins.
Stir in the garlic, celery, and carrots and cook for 2-3 mins. Deglaze with the white wine and continue to cook until wine is reduced by half, about 3-4 mins.