Italian Chicken and Bean Stew

Name: Italian Chicken and Bean Stew
Ingredients: 8 bone-in, skin-on chicken thighs (about 2 1/2 pounds); Kosher salt and freshly ground black pepper; 3 tablespoons extra-virgin olive oil; 1 small onion, chopped; 4 cloves garlic, finely chopped; 1/4 teaspoon red pepper flakes; 1 tablespoon tomato paste; 1/2 cup dry white wine; 2 cups low-sodium chicken broth; One 15-ounce can cannellini bean, rinsed and drained; One 14-ounce can diced tomatoes; 1 teaspoon dried oregano; 1/3 cup grated Parmesan, plus more for serving; Fresh oregano for garnish (optional)