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French onion chicken casserole in a 9x13 baking dish with golden crispy French fried onion topping fresh from the oven

French Onion Chicken Casserole

A hearty, comforting baked casserole with tender shredded chicken, a rich creamy sauce made with cheddar, sour cream, and cream of chicken soup, topped with crispy golden French fried onions. Ready in 45 minutes with fewer than 10 ingredients.
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Prep Time 10 minutes
Cook Time 38 minutes
Total Time 48 minutes
Servings: 6 portions
Course: Casserole, Dinner, Main Course
Cuisine: American
Calories: 489
Ingredients Equipment Method Notes

Ingredients
  

  • 3 cups cooked chicken shredded or diced, rotisserie chicken recommended
  • 1 cup green beans drained, canned or fresh blanched
  • 1 cup shredded cheddar cheese shred from block for best melt
  • 0.5 cup sour cream
  • 0.33 cup mayonnaise full-fat recommended
  • 10.5 oz cream of chicken soup 1 can
  • 0.33 cup slivered almonds
  • 6 oz French fried onions added as topping only, do not mix into filling

Equipment

  • 9x13-inch baking dish
  • Large mixing bowl
  • Non-stick cooking spray
  • Oven

Method
 

  1. Preheat oven to 400 degrees F. Spray a 9x13 inch baking dish with non-stick cooking spray, including the sides, and set aside.
  2. In a large mixing bowl, combine the shredded chicken, green beans, shredded cheddar cheese, sour cream, mayonnaise, cream of chicken soup, and slivered almonds. Stir until everything is evenly combined and the mixture is thick and creamy.
  3. Spread the chicken mixture evenly into the prepared baking dish in an even layer. Bake uncovered at 400 degrees F for 30 minutes until bubbling around the edges and heated through.
  4. Remove from the oven and sprinkle the French fried onions in an even layer across the top. Return to the oven for 5 to 8 minutes until the onions are golden brown and crispy.
  5. Remove from the oven and let the casserole rest for 5 minutes before serving to allow the sauce to settle and thicken slightly.

Notes

Use rotisserie chicken to save prep time. If using fresh green beans, blanch for 3 to 4 minutes before adding. Do not add French fried onions before freezing — add fresh just before baking. Make ahead: assemble without onion topping, refrigerate up to 24 hours, add onions and bake when ready. Reheat at 350 degrees F for 25 to 30 minutes. Freeze tightly wrapped without topping for up to 3 months.