In a large mixing bowl, combine the shredded chicken, steamed broccoli, cooked quinoa (or rice), 3/4 cup of the shredded cheddar cheese, cream of mushroom soup, Greek yogurt, garlic powder, onion powder, black pepper, and salt. Mix everything together until well incorporated.
Transfer the mixture into a greased 9x13 inch baking dish, spreading it evenly.
In a small bowl, combine the breadcrumbs and olive oil. Stir until the breadcrumbs are evenly coated. Sprinkle the breadcrumb mixture over the chicken and broccoli mixture in the baking dish.
Top with the remaining 1/4 cup of shredded cheddar cheese.
Bake in the preheated oven for 25-30 minutes, until the casserole is bubbling and the top is golden brown.
Remove from the oven and let it cool for a few minutes before serving.
Notes
Serve hot, garnished with fresh parsley or a sprinkle of paprika for added color. Enjoy with a side salad for a complete meal!