Creating Baked Greek Chicken Casserole is straightforward if you follow these easy steps:

1. Preheat the Oven: Begin by preheating your oven to 375°F (190°C).
2. Prepare the Chicken: Season the chicken thighs with salt, pepper, oregano, and thyme. Drizzle with olive oil and set aside.
3. Sauté the Vegetables: In a large skillet, heat a splash of olive oil over medium heat. Add the onions and garlic, sautéing until softened.
4. Add the Peppers and Tomatoes: Stir in the bell peppers and cherry tomatoes, cooking for an additional 5 minutes until slightly softened.
5. Combine Ingredients: In a large mixing bowl, combine the cooked vegetables, lemon juice, lemon zest, Greek yogurt, and half of the feta cheese. Mix until well combined.
6. Layer the Casserole: Spread the vegetable mixture into a greased baking dish and place the seasoned chicken thighs on top.
7. Top with Feta: Sprinkle the remaining feta cheese over the chicken and add olives if desired.
8. Bake: Cover the baking dish with foil and bake for 30 minutes. Then, remove the foil and bake for an additional 15 minutes until the chicken is cooked through and the top is golden.
9. Rest the Casserole: Once cooked, remove from the oven and let it sit for 5 minutes.
10. Garnish and Serve: Garnish with fresh parsley before serving.

Following these steps will guide you in creating an incredible Baked Greek Chicken Casserole that is sure to impress!