Prepare the ingredients by washing and chopping zucchini and red bell peppers, and slicing red onion. Cut chicken into uniform chunks.

Heat olive oil over medium-high heat. Add chicken pieces and sauté for 5-7 minutes until golden brown and cooked through.

Sauté red onion and minced garlic for 1-2 minutes, then add zucchini and red bell peppers. Cook for 4-5 minutes until tender.

Combine chicken with vegetables, stirring gently. Cook for another 2 minutes to meld flavors.

Drizzle lemon juice, add feta cheese and olives. Mix and heat through for a minute.