Preheat your oven to 400°F (200°C).
In a large bowl, combine cilantro, lemon zest, lemon juice, lime juice, olive oil, herb-seasoning blend, Creole-style seasoning, onion powder, garlic powder, dried oregano, black pepper, and paprika. Whisk until combined.
10 bone-in, skin-on chicken thighs
Add chicken thighs to the bowl and coat evenly with the marinade.
10 bone-in, skin-on chicken thighs
Arrange chicken thighs in a single layer on a baking sheet.
10 bone-in, skin-on chicken thighs
Roast for 35-45 minutes, or until chicken is cooked through and skin is crispy.
10 bone-in, skin-on chicken thighs
While chicken roasts, place peeled and chunked potatoes in a large pot, cover with cold water, and add salt.
10 bone-in, skin-on chicken thighs
Bring water to a rolling boil, then reduce heat and simmer for 15-20 minutes, or until potatoes are fork-tender.
10 bone-in, skin-on chicken thighs
Drain potatoes thoroughly.
10 bone-in, skin-on chicken thighs
Return drained potatoes to the pot. Add butter, heavy cream, Creole-style seasoning, black pepper, garlic powder, and onion powder.
10 bone-in, skin-on chicken thighs
Mash until smooth and creamy. Taste and adjust seasonings.
10 bone-in, skin-on chicken thighs
For the gravy, heat olive oil and butter in a large saucepan over medium heat.
10 bone-in, skin-on chicken thighs
Whisk in flour and cook for 1-2 minutes until lightly golden brown to make a roux.
10 bone-in, skin-on chicken thighs
Slowly whisk in broth until smooth.
10 bone-in, skin-on chicken thighs
Bring to a gentle simmer, stirring constantly until thickened.
Stir in heavy cream, Creole-style seasoning, black pepper, garlic powder, onion powder, and optional hot sauce.
10 bone-in, skin-on chicken thighs
Simmer for another 2-3 minutes until heated through.