Marry Me Meatballs

Name: Marry Me Meatballs
Ingredients: 1/2 cup panko (Japanese breadcrumbs); 1/3 cup, plus 1/4 cup heavy whipping cream, divided; 1 large egg; 1/2 cup whole milk ricotta cheese; 6 ounces Parmigiano-Reggiano cheese, grated on smallest holes of box grater, divided (1 1/2 cups); 3 large garlic cloves, grated, divided (1 1/2 teaspoons); 3 teaspoons Italian seasoning, divided; 2 teaspoons kosher salt, divided; 2 pounds ground chicken (preferably white and dark meat); 1/2 cup drained, roughly chopped sun-dried tomatoes in oil, plus 4 tablespoons oil reserved, divided; 1 large shallot, finely chopped (about 1/2 cup); 1/4 teaspoon crushed red pepper; 2 tablespoon tomato paste; 1 cup chicken stock; Chopped fresh flat-leaf parsley, for garnish