Heat olive oil in a large skillet over medium heat. Add chicken, season with salt, pepper, garlic powder, and oregano. Cook for 5-7 minutes until browned and cooked through. Remove chicken and set aside.
In the same skillet, add orzo and toast for 1-2 minutes. Pour in chicken broth, bring to a boil, then reduce to a simmer and cover. Cook for 10 minutes until orzo is tender.
Stir in cherry tomatoes, baby spinach, and cooked chicken. Cook for an additional 2-3 minutes until spinach wilts.
Add feta cheese and lemon juice, stirring until well combined. Adjust seasoning if needed.
Remove from heat and stir in fresh basil. Serve warm.