Baked Spaghetti and Meatballs

Name: Baked Spaghetti and Meatballs
Cook time: 1 h 20 min
Total time: 1 h 20 min
Cuisine: Italian
Ingredients: 1.5 pounds ground beef; 1 cup seasoned panko bread crumbs; 0.75 cup whole milk; 2 large eggs, beaten; Kosher salt and black pepper; 4 cups marinara sauce (32 ounces); 12 ounces spaghetti, broken in half; 3 sprigs basil, plus leaves for garnishing; 8 ounces fresh mozzarella, sliced; Green salad, for serving