In a large bowl, combine olive oil, lemon zest, orange zest, lemon juice, orange juice, minced garlic, rosemary, thyme, salt, black pepper, smoked paprika, and red pepper flakes. Mix well to create a marinade.
Add the chicken drummers to the bowl and toss until they are fully coated in the marinade. Cover the bowl with plastic wrap or transfer everything to a resealable zipper bag. Refrigerate for at least 1 hour, preferably overnight, for the best flavor.
Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper or lightly grease it to prevent sticking.
Remove the chicken from the marinade and arrange them on the prepared baking sheet in a single layer. Discard the leftover marinade.
Bake in the preheated oven for 35-40 minutes, or until the chicken is cooked through and the skin is crispy. Chicken should reach an internal temperature of 165°F (74°C).
For an extra crispy finish, switch the oven to broil and cook for an additional 2-3 minutes, keeping a close eye to prevent burning.
Remove from the oven, let rest for 5 minutes, and then garnish with freshly chopped parsley before serving.
Serve with your favorite sides, such as roasted vegetables or a fresh garden salad.