Heat the olive oil in a large skillet over medium heat.
Add the chopped onion and minced garlic to the skillet, sautéing until the onion becomes translucent (about 3 minutes).
Add the cubed chicken breast to the skillet, seasoning with salt and pepper. Cook for about 5-7 minutes, stirring occasionally, until the chicken is browned and cooked through.
Stir in the red bell pepper, zucchini, and broccoli florets. Cook for an additional 5 minutes until the vegetables begin to soften.
Sprinkle the dried Italian herbs over the mixture and pour the chicken broth into the skillet. Bring to a simmer, cover, and cook for another 5 minutes until the vegetables are tender.
Remove the skillet from the heat and squeeze the lemon juice over the dish before serving.
Feel free to substitute any vegetables you have on hand or prefer, such as carrots or green beans.
To add more flavor, marinate the chicken for 30 minutes before cooking using olive oil, lemon juice, and herbs.
Serve over brown rice or quinoa for a more filling meal.