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Creamy French Onion Chicken Casserole Recipe

The whole family will love this creamy chicken casserole topped with crispy onions. It comes together in minutes and requires just a handful of ingredients.

Overhead view of a white baking dish filled with a cooked French onion chicken casserole. A red striped dish towel is in the background.

All my favorite casseroles are cheesy, comforting, and easy to prepare. This French onion chicken casserole checks all those boxes. It combines tender chicken and egg noodles with a rich, creamy base flavored with French onion dip, then finishes with a generous sprinkling of crispy fried onions for crunch and classic flavor.

French’s crispy fried onions—commonly used as a green bean casserole topping—add an irresistible texture and savory onion note when mixed through the casserole and again on top just before serving. If you only pull them out at holiday time, try keeping a can on hand year‑round; they work wonderfully on many dishes.

Close up of French onion chicken casserole topped with crispy onions in a white casserole dish.

To boost the savory onion flavor and create a smooth, tangy sauce, this casserole uses sour cream–based French onion dip as part of the creamy mixture. The result is a hearty, family‑friendly dinner that’s ready in about 35 minutes total, including baking time.

If you enjoy casserole dinners, try swapping ingredients to customize the dish: use different cheeses, add vegetables like peas or green beans, or serve over rice instead of egg noodles.

Ingredients

All the ingredients needed to make French Onion Chicken Casserole in prep bowls.
  • Chicken – About 3 cups cooked, chopped chicken. Store‑bought rotisserie chicken makes this especially quick.
  • Egg noodles – 8 ounces cooked; you may substitute another pasta if preferred.
  • Cheddar cheese – 1 cup shredded. Cheddar adds richness; feel free to use Swiss, mozzarella, or a blend.
  • Cream of chicken soup – 1 can. Cream of mushroom or cream of celery are suitable alternatives.
  • Crispy fried onions – Use a 6‑ounce container, divided; reserve half for topping. Crushed crackers or breadcrumbs can substitute in a pinch.
  • French onion dip – 2 cups (sour cream‑based). Plain sour cream with onion soup mix or caramelized onions will also work.
  • Spices – 1 teaspoon onion powder, 1 teaspoon garlic powder, ½ teaspoon thyme.

How To Make

A four photo collage showing the steps to make French onion chicken casserole.
  1. Preheat the oven to 350°F (175°C). Lightly grease a 9×13‑inch baking dish with cooking spray or a little oil.
  2. In a large bowl, combine the chopped cooked chicken, cooked egg noodles, shredded cheddar, cream of chicken soup, half of the crispy fried onions, French onion dip, onion powder, garlic powder, and thyme. Stir until everything is evenly coated.
  3. Transfer the mixture to the prepared baking dish and spread it into an even layer.
  4. Bake for 20–25 minutes, until the casserole is heated through and the cheese is melted and bubbly.
  5. Remove from the oven, sprinkle the reserved crispy fried onions over the top, and return the dish to the oven for 4–5 minutes to crisp and brown the topping.
  6. Let the casserole rest a few minutes before serving so it sets slightly for easier scooping.

Tips

  • Prep ahead: Assemble the casserole, cover tightly, and refrigerate up to 24 hours. Bake straight from the fridge, adding a few extra minutes if needed.
  • Make it vegetarian: Replace chicken with firm tofu cubes or a mix of cooked beans and vegetables such as peas, mushrooms, or green beans.
  • Cheese and texture variations: Swap in Swiss or provolone for a milder flavor, or add a small amount of grated Parmesan for depth. For extra crunch, mix in some panko or crushed crackers with the fried onions on top.
A wooden spoon with a scoop of French onion casserole.

Leftovers

How To Store

Allow leftovers to cool to room temperature, then transfer to an airtight container. Store in the refrigerator for up to 3 days or freeze for up to 6 months. Thaw frozen casserole overnight in the refrigerator before reheating.

How To Reheat

To reheat from refrigerated, bake at 350°F for 8–10 minutes or until heated through. If reheating individual portions, a microwave is fine—heat until steaming, then briefly crisp the topping in a hot oven or toaster oven if desired.

A white dinner plate with a serving of French onion chicken casserole. The rest of the casserole is in a baking dish out of focus in the background.

French Onion Chicken Casserole

A creamy, cheesy chicken casserole flavored with French onion dip and finished with crispy fried onions. Easy to assemble and perfect for weeknights.

Prep Time: 10 mins

Cook Time: 25 mins

Total Time: 35 mins

Servings: 6

Ingredients

  • 3 cups cooked chicken, chopped
  • 8 oz egg noodles, cooked
  • 1 cup shredded cheddar cheese
  • 1 can cream of chicken soup
  • 6 oz crispy fried onions, divided
  • 2 cups sour cream–based French onion dip
  • 1 tsp onion powder
  • 1 tsp garlic powder
  • 1/2 tsp thyme

Instructions

  1. Preheat oven to 350°F and grease a 9×13‑inch baking dish.
  2. In a large bowl, mix chicken, cooked noodles, cheese, soup, half the fried onions, French onion dip, and spices until evenly combined.
  3. Spread the mixture in the prepared dish and bake 20–25 minutes, until heated through and bubbly.
  4. Top with the remaining fried onions and bake 4–5 minutes more until the topping is golden and crisp.
  5. Let rest a few minutes, then serve warm.

Nutrition (per serving)

Calories: 678 kcal • Carbohydrates: 56 g • Protein: 34 g • Fat: 38 g • Sodium: 632 mg

Author: Jessica Pinney