Heat the olive oil in a large skillet over medium heat.
Season the chicken breasts with oregano, salt, and black pepper.
Cook the chicken for 5–7 minutes per side until golden brown and fully cooked. Remove from the skillet and set aside.
In the same skillet, sauté the garlic, cherry tomatoes, zucchini, bell pepper, and red onion for 4–5 minutes until slightly tender.
Stir in the orzo and pour in the chicken broth. Bring to a gentle boil.
Reduce the heat, cover, and simmer for about 10 minutes, stirring occasionally, until the orzo is al dente and most of the liquid has been absorbed.
Return the chicken to the skillet. Drizzle the balsamic vinegar over everything and simmer for another 2–3 minutes so the flavors blend together.
Garnish with fresh basil and serve your Easy Balsamic Chicken Orzo warm.