Creating Greek Chicken Casserole is simple when you follow these steps:

1. Preheat the Oven: Start by preheating your oven to 375°F (190°C).
2. Cook the Chicken: In a skillet, heat olive oil over medium heat. Add chicken breasts and cook for about 6-7 minutes on each side until they are golden brown and cooked through. Remove from heat and let cool slightly before slicing.
3. Prepare the Pasta: Cook your pasta according to package instructions until al dente. Drain and set aside.
4. Sauté Vegetables: In the same skillet, add diced red onion and minced garlic. Sauté for about 2-3 minutes until the onion is translucent. Add bell peppers and spinach, cooking for another 2-3 minutes until just tender.
5. Combine Ingredients: In a large mixing bowl, combine the cooked pasta, sautéed vegetables, sliced chicken, cherry tomatoes, olives, feta cheese, dried oregano, dried basil, salt, black pepper, chicken broth, and lemon juice. Mix well to combine.
6. Transfer to Baking Dish: Pour the mixture into a greased 9×13 inch baking dish, spreading it evenly.
7. Bake: Place the baking dish in the preheated oven and bake for 30-35 minutes until heated through and the top is slightly golden.
8. Garnish: Once out of the oven, garnish with fresh parsley if desired before serving.

Following these steps will ensure that your Greek Chicken Casserole turns out deliciously every time!