Heat olive oil in a large skillet over medium heat.
Season chicken with salt, pepper, and Italian seasoning. Add to skillet and cook until browned and cooked through, about 5–6 minutes.
Add garlic and sauté for 1 minute until fragrant.
Stir in orzo and cook for 1–2 minutes.
Add chicken broth, lemon zest, and lemon juice. Bring to a boil, then reduce heat and simmer for 10–12 minutes until orzo is tender and liquid is absorbed.
Stir in spinach and cook until wilted, about 2 minutes.
Remove from heat and mix in feta cheese.
Garnish with fresh parsley before serving.