Creating Italian Vinegar Chicken is a simple process if you follow these easy steps:

1. Prepare the Marinade: In a bowl, combine the red wine vinegar, olive oil, minced garlic, oregano, salt, black pepper, and red pepper flakes (if using).
2. Marinate the Chicken: Place the chicken thighs in a large resealable bag or shallow dish. Pour the marinade over the chicken, ensuring each piece is coated. Seal or cover and refrigerate for at least 1 hour.
3. Preheat the Oven: Preheat your oven to 400°F (200°C).
4. Arrange Chicken in Baking Dish: Remove the chicken from the marinade and place it in a baking dish, skin side up. Discard the marinade.
5. Bake the Chicken: Put the baking dish in the preheated oven and bake for 30-45 minutes, or until the chicken is cooked through and the skin is crispy. The internal temperature should reach 165°F (75°C).
6. Baste (Optional): Halfway through cooking, you can baste the chicken with the drippings for extra flavor.
7. Rest the Chicken: Once cooked, remove the chicken from the oven and let it rest for about 5 minutes before serving.
8. Garnish: Sprinkle freshly chopped parsley over the chicken for a pop of color and added flavor.

These steps will guide you in creating this incredible dish with ease.