Add minced garlic and chopped bell pepper; cook for 2-3 minutes until fragrant and softened.
Add chicken pieces, season with salt, pepper, oregano, and thyme; cook until browned on all sides.
Stir in rinsed quinoa and chicken broth; bring to a boil, then reduce heat, cover, and simmer for 15-20 minutes until quinoa is fluffy and liquid absorbed.
Remove from heat, stir in spinach, cover, and let sit for 2-3 minutes until wilted. Fluff with a fork, then garnish with parsley and lemon juice if desired.
Notes
For extra flavor, add a squeeze of lemon juice before serving. Adjust seasoning to taste.