Turkey Pesto Meatball Soup

Name: Turkey-Pesto Meatball Soup
Ingredients: 12 ounces ground turkey (preferably dark meat); 3 tablespoons Pesto , plus more for serving; 6 tablespoons panko breadcrumbs; 1 lightly whisked egg; 3 tablespoons grated Parmigiano-Reggiano, plus more for serving; ¾ teaspoon kosher salt; ½ teaspoon freshly ground pepper, plus more for serving; 1 smashed and peeled garlic clove; 4 cups low-sodium chicken broth; 2 sprigs fresh basil; 1 cup chopped escarole