Preheat oven to 400°F
In a large bowl combine ground chicken, onion, garlic, ½ cup mozzarella cheese, ½ cup Parmesan cheese, parsley, and egg. Mix gently until combined. Don't overmix.
454 g ground chicken (1 lb), ¼ large onion,, 1 clove garlic,, ½ cup mozzarella cheese,, ½ cup Parmesan cheese, plus more for topping, ¼ cup fresh parsley,, 1 egg
Using a scoop or a large soup spoon, shape into 1 ½ - 2-inch balls. Place the meatballs on a plate and set them aside in the refrigerator.
Heat olive oil in a large skillet over medium-low heat. Sautee onion for 4-5 minutes or until soft and translucent. Add garlic, oregano and chili flakes. Stir and continue cooking and stirring for 1 minute.
2 tablespoon olive oil, ½ large white or yellow onion,, 4 cloves garlic,, ½ teaspoon dried oregano, ¼ teaspoon crushed red chili flakes,
Add tomato puree, salt, and basil. Stir together and bring to a gentle simmer. Continue simmering gently for 5 minutes.
2 tablespoon fresh basil, 1 680 ml jar strained tomato passata or one can whole tomatoes ((3 cups), ½ teaspoon salt
Add prepared meatballs to pan and place in preheated oven for 10 minutes.
Remove from oven and carefully flip meatballs. Return to oven and bake for another 10 minutes or until meatballs are cooked through. Check this by cutting one in half or with a thermometer reading 165° F.
Remove from oven and turn the broiler to high. Make sure the oven rack is in the center position.
Top the meatballs with 1 ½ cups mozzarella cheese and finish with ¼ cup Parmesan. Place under the broiler for 2 minutes or until cheese is melted and bubbling.
1 ½ cups mozzarella cheese,, ¼ cup Parmesan cheese
Sprinkle fresh, chopped basil on top (if using), and serve.
Fresh basil,