Season and Sear Chicken:
Pat chicken thighs dry and season with salt, pepper, garlic powder, and paprika. Heat olive oil in a large oven-safe skillet or Dutch oven over medium-high. Sear chicken skin-side down for 5–6 minutes until golden, then flip and cook 2–3 minutes more. Remove and set aside.
Sauté Aromatics:
In the same skillet, reduce heat to medium. Add chopped onion and garlic, sauté for 2–3 minutes until fragrant.
Toast Orzo:
Stir in orzo and toast for 1–2 minutes until slightly golden.
Add Broth and Herbs:
Pour in chicken broth, oregano, lemon juice, and zest if using. Stir and bring to a simmer.
Combine and Cook:
Nestle chicken thighs back into the pan, skin-side up. Cover and simmer on low for 20–25 minutes, until orzo is tender and chicken is fully cooked (165°F internal temperature).
Finish:
Remove lid. Stir in spinach and Parmesan if using, and cook for 1–2 minutes until wilted. Let rest for a few minutes before serving.
Serve:
Garnish with fresh herbs and enjoy warm.