Baked Chicken Parmesan Meatballs

Name: Baked Chicken Parmesan Meatballs
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Cuisine: American, Italian
Ingredients: 1 tablespoon olive oil; 1/4 cup chopped onion; 1 tablespoon tomato paste; 1 clove garlic (minced); 2 tablespoons fresh parsley (chopped); 2 tablespoons fresh basil (chopped); 1 teaspoon dried oregano; 1/2 teaspoon red pepper flakes; 1 can (28 ounce) crushed tomatoes; 1/4 cup heavy cream; 1 1/2 pounds ground chicken; 3 ounces baby spinach (chopped into small pieces); 1/3 cup dried panko bread crumbs; 1/4 cup diced onion; 1/3 cup + 2 tablespoons freshly grated Parmesan cheese (divided); 1/2 teaspoon kosher salt; 1/4 teaspoon ground black pepper; 3 cloves garlic (minced); 1 egg (lightly beaten); 2 tablespoons olive oil; 4 ounces shredded mozzarella; minced fresh basil (for garnish)