4-Ingredient Chicken Wellington Casserole

Some recipes become family traditions simply because everyone keeps asking for them. This 4-ingredient Chicken Wellington Casserole is one of those easy comfort-food dinners that feels special enough for a family celebration but simple enough for a busy weeknight.

Tender cooked chicken is combined with creamy chicken soup and sour cream, then topped with flaky puff pastry and baked until golden brown and bubbling. The result is an easy chicken casserole with puff pastry that delivers creamy, savory filling underneath a crisp, buttery topping.

With just 4 simple ingredients, this oven-baked chicken casserole is affordable, comforting, and incredibly easy to prepare.

Why You’ll Love This 4-Ingredient Chicken Casserole

• Only 4 main ingredients – Perfect when you want a simple dinner.
• Quick preparation – Most of the work is simply mixing and assembling.
• Creamy and comforting – Chicken, sour cream, and cream soup create a rich filling.
• Golden puff pastry topping – Adds an impressive flaky crunch.
• Great for families – Makes 6 generous servings.
• Perfect for leftovers – Use leftover roasted chicken or turkey.
• Easy enough for weeknights – No complicated cooking techniques required.
• Family gathering favorite – Delicious enough for birthdays, potlucks, and Sunday dinners.

Prep Time: 10 minutes
Cook Time: 25–30 minutes
Resting Time: 5–10 minutes
Total Time: About 45–50 minutes
Servings: 6

Ingredients

• 3 cups cooked chicken, chopped or shredded
• 1 can (10.5 ounces) cream of chicken soup
• 1 cup sour cream
• 1 sheet puff pastry, thawed

How to Make Chicken Wellington Casserole

1. Preheat the oven.
   Heat your oven to 400°F (200°C). Lightly grease a 9×13-inch baking dish.
2. Make the creamy chicken filling.
   Add the cooked chicken, cream of chicken soup, and sour cream to a large bowl. Stir until everything is evenly combined.
3. Fill the baking dish.
   Spread the creamy chicken mixture evenly across the prepared dish.
4. Add the puff pastry.
   Place the thawed puff pastry over the chicken filling. Gently stretch it if necessary to cover most of the surface. Cut a few small slits in the pastry to allow steam to escape.
5. Bake until golden.
   Bake for 25–30 minutes, or until the puff pastry is beautifully puffed and golden brown and the chicken filling is hot and bubbling around the edges.
6. Let it rest.
   Remove from the oven and allow the casserole to rest for 5–10 minutes before serving. This gives the creamy filling a chance to settle.

Tips for the Best Chicken Wellington Casserole

Keep the puff pastry cold:
Cold puff pastry produces a lighter, flakier topping. Let it thaw enough to unfold without cracking, but don’t allow it to become overly warm or sticky.

Use leftover chicken:
This recipe is an excellent way to transform leftover roasted or baked chicken into a completely different meal.

Let the casserole rest:
Waiting a few minutes before serving makes the creamy filling easier to scoop and helps prevent it from being overly runny.

Want more flavor?
A little black pepper, dried parsley, garlic powder, or chopped fresh herbs can add extra flavor while keeping the recipe simple.

Easy Variations

Turkey Wellington Casserole

Replace the cooked chicken with an equal amount of cooked turkey. It’s an especially convenient option after Thanksgiving or a holiday meal.

Chicken and Vegetable Casserole

For a more complete one-dish dinner, stir in cooked peas, carrots, broccoli, or mixed vegetables before adding the puff pastry.

Herb Chicken Casserole

Add a pinch of dried thyme, parsley, or Italian seasoning to the creamy chicken mixture for extra savory flavor.

What to Serve With Chicken Wellington Casserole

Because this casserole is creamy and rich, fresh or lightly seasoned sides pair especially well with it.

Try serving it with:

• Buttered green beans
• Sweet corn
• Garden salad
• Roasted baby potatoes
• Steamed broccoli
• Sliced fresh tomatoes
• Fresh seasonal fruit

Frequently Asked Questions

Can I use rotisserie chicken?

Yes. Rotisserie chicken is an excellent shortcut for this recipe. Simply remove the skin and bones, then shred or chop the meat.

Can I substitute turkey for chicken?

Absolutely. Cooked turkey works very well and makes this recipe a useful way to repurpose holiday leftovers.

Can I prepare this casserole ahead of time?

You can prepare the chicken filling ahead of time and refrigerate it. For the flakiest pastry, add the puff pastry shortly before baking.

Why should I cut slits in the puff pastry?

Small vents allow steam to escape while the casserole bakes and help prevent excess moisture from making the pastry soggy.

Can I use homemade cream of chicken soup?

Yes. Homemade cream of chicken soup can be substituted for the canned soup if you prefer.