Combine red wine vinegar, lemon zest and juice, Dijon mustard, minced garlic, dried oregano, salt, black pepper, and olive oil in a bowl to create a marinade.

Add the chicken tenderloins to the marinade and ensure they are well coated. Marinate for at least 30 minutes.

Preheat the oven to 400°F (200°C).

Transfer the marinated chicken to a baking dish and bake for 20 minutes or until the chicken is cooked through.

Season with additional salt and black pepper before serving, and garnish with fresh oregano if desired.