Creating Greek Chicken Casserole can be simple if you follow these straightforward steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Chicken: Season the chicken breasts with salt, pepper, oregano, and thyme.
3. Sauté Vegetables: In a large skillet, heat the olive oil over medium heat. Add the chopped onion and minced garlic, cooking until softened.
4. Add Bell Peppers: Stir in the chopped bell peppers and cook for about 5 minutes until they are slightly tender.
5. Combine Ingredients: Add the cherry tomatoes, black olives, and chicken broth to the skillet. Mix well.
6. Add Chicken: Place the seasoned chicken breasts in the skillet, ensuring they are surrounded by the vegetable mixture.
7. Top with Feta: Sprinkle the crumbled feta cheese evenly over the chicken and vegetable mixture.
8. Transfer to Oven: Carefully transfer the skillet or pour the mixture into a baking dish if needed. Cover with aluminum foil.
9. Bake: Place in the preheated oven and bake for 30 minutes. Remove the foil and bake for an additional 20 minutes, or until the chicken is cooked through and no longer pink.
10. Garnish: Once out of the oven, sprinkle with fresh parsley before serving.

These steps will guide you in creating this flavorful casserole effortlessly.