Heat olive oil in a large skillet over medium-high heat.
Add the ground chicken to the skillet, breaking it apart with a spatula. Season with salt, black pepper, and dried oregano.
Cook the chicken until browned and cooked through, approximately 5 to 7 minutes.
Add the diced onion and red bell pepper to the skillet. Sauté for 3 to 4 minutes until the vegetables begin to soften.
Stir in the zucchini and minced garlic. Cook for an additional 3 minutes until the zucchini is tender-crisp.
Add the Kalamata olives and lemon juice. Toss the mixture to combine and heat through for 1 minute.
Remove the skillet from heat. Top with crumbled feta cheese and fresh parsley before serving.