Stuffed Banana Peppers

Name: Stuffed Banana Peppers
Ingredients: Kosher salt and freshly ground black pepper; 4 banana peppers; 2 tablespoons fine breadcrumbs; 2 tablespoons milk; 2 tablespoons olive oil; 1 yellow onion, minced; 2 garlic cloves, minced; 1 cup (250 milliliters) tomato passata or crushed tomatoes; 8.8 ounces (250 grams) lean ground beef; 3.5 ounces (100 grams) spicy Italian sausage, casing removed; 1 egg yolk; 1/4 cup (20 grams) finely grated Parmigiano-Reggiano, plus more for serving; 1 tablespoon finely chopped parsley, plus more for serving; 2 teaspoon finely chopped oregano