In a large skillet, heat the olive oil over medium heat. Add the chopped onion and sauté for about 3-4 minutes until softened.
Stir in the minced garlic and diced red bell pepper, cooking for an additional 2-3 minutes until the peppers are tender.
Add the ground chicken to the skillet, breaking it apart with a spatula. Cook until browned and fully cooked through, about 6-8 minutes.
Stir in the cherry tomatoes, Kalamata olives, oregano, basil, salt, and pepper. Cook for another 5 minutes until the tomatoes are softened and the flavors meld together.
Remove from heat and sprinkle the crumbled feta cheese on top. Garnish with fresh parsley before serving.