This delicious casserole has the rich taste of French onion soup and the crispy and cheesy texture of a chicken casserole. In this video, learn how to make French onion chicken casserole. This recipe combines a buttery caramelized onion mixture together with a creamy shredded chicken mixture into a baking dish that’s topped with mozzarella, gruyere, and crispy fried onions. Bake it in the oven for around thirty minutes at 350 degrees. It’s easy, tasty, and great for dinner!