In a large skillet, heat olive oil over medium heat. Add the diced chicken and season with salt, pepper, garlic powder, and Italian herbs. Sauté until the chicken is golden brown and cooked through, about 6-8 minutes.
Once the chicken is cooked, add the cherry tomatoes, bell pepper, and zucchini to the skillet. Cook for another 4-5 minutes until the vegetables start to soften.
Stir in the orzo and balsamic vinegar, mixing everything together well.
Add 4 cups of water to the skillet and bring to a gentle boil. Reduce the heat to low, cover, and let it simmer for about 10-12 minutes or until the orzo is cooked al dente and has absorbed most of the liquid, stirring occasionally.
Toss in the chopped spinach and mix until wilted. Taste and adjust seasoning with salt and pepper if needed.
Serve warm, topped with grated Parmesan cheese if desired.
Notes
Grated Parmesan cheese can be added for extra flavor.