Preheat Oven: Set the oven to 200°C / 400°F.
Sauté Vegetables: In a large oven-safe skillet, heat olive oil over medium heat. Add the diced onion and cook for 5 minutes until softened.
Add Flavour: Stir in garlic, red pepper, kale, oregano, red pepper flakes, and salt. Cook for 5 minutes until the kale wilts.
Build the Base: Mix in tomato paste and sauté for 1–2 minutes to release the flavours.
Combine Ingredients: Add orzo, diced tomatoes, cooked chicken or chickpeas, and broth. Bring to a gentle simmer.
Bake: Place the skillet in the oven and bake for 10–15 minutes, or until the orzo is tender.
Finish: Stir in butter if using. Top with crumbled feta, fresh dill, a squeeze of lemon juice, and freshly ground black pepper. For softer feta, return the skillet to the oven for an extra 5 minutes.