Creating the French Onion Chicken Orzo Casserole is easy when you follow these steps:

1. Preheat the Oven: Set your oven to 375°F (190°C).
2. Cook the Onions: In a large skillet, heat olive oil over medium heat. Add the sliced onions and cook until they are caramelized, stirring occasionally. This should take about 15-20 minutes.
3. Sear the Chicken: While the onions are cooking, season the chicken breasts with salt, pepper, garlic powder, and onion powder. In another skillet, sear the chicken over medium heat until browned on both sides, about 4-5 minutes per side.
4. Prepare the Orzo: In a pot, bring the chicken broth to a boil. Add the uncooked orzo and cook according to package instructions until al dente, usually around 8-10 minutes. Drain and set aside.
5. Combine Ingredients: In a large mixing bowl, combine the caramelized onions, cooked orzo, heavy cream, balsamic vinegar, and shredded Swiss cheese. Mix well.
6. Layer the Casserole: Spread half of the orzo mixture in a baking dish. Place the seared chicken on top, then cover with the remaining orzo mixture.
7. Bake: Cover the dish with aluminum foil and bake for 25-30 minutes. Then remove the foil and bake for an additional 10-15 minutes until the top is golden and bubbly.
8. Rest: Let the casserole rest for 10-15 minutes before serving to allow it to set.
9. Garnish: Before serving, sprinkle chopped fresh parsley on top for a fresh touch.

With these steps, you will have a delicious and hearty casserole that is sure to impress!