Creamy Chicken Pasta Casserole
A cozy, ultra-creamy chicken pasta casserole that stays saucy in the oven. Learn the simple food science trick to prevent dry, mushy pasta bakes forever.
- Undercooking the pasta allows it to finish cooking in the oven, absorbing the savory sauce rather than boiling water.
- Freshly grated cheese melts into a smooth protein matrix without the grainy texture of pre-shredded bags.
- Searing the chicken first builds a rich fond on the bottom of the pan for deep, savory flavor.
The first time I tried making a pasta bake in my drafty college apartment, I ended up with a dry, gluey brick of starch that could have doubled as a doorstop. I actually cried over the wasted block of expensive cheddar. My roommates politely chewed through the cement-like layers, but we ended up ordering pizza anyway.
That spectacular failure launched my obsessive quest to master the physics of a truly creamy bake. I wanted something that stayed saucy, even after a trip to the oven.
Think about this in terms of physics: pasta acts like a sponge, continuously absorbing liquid even after it leaves the boiling water. When you bake it, the starch gelatinization process accelerates, sucking up the surrounding sauce while the proteins in the cheese coagulate and squeeze out moisture. This brand of mistake—boiling the pasta to package directions before baking—failed every single test because it leaves zero room for the noodles to expand in the oven. You end up with bloated, mushy tubes swimming in broken oil.
Here is the simple fix: undercook your pasta by exactly three minutes.
This ensures the pasta finishes cooking directly in the sauce, absorbing the savory chicken broth instead of plain water. If you love cozy bakes, this is a sister recipe to my Baked Tuscan Chicken Casserole, but with a focus on pure, unadulterated cheddar goodness. Trust me on this one, it makes all the difference.
Creamy Chicken Pasta Casserole
Ingredients
- 350g penne pasta
- 2 tbsp olive oil
- 500g chicken breast, diced
- 1 tbsp Diamond Crystal kosher salt (divided)
- 1/2 tsp freshly cracked black pepper
- 3 tbsp unsalted butter
- 3 cloves garlic, minced
- 3 tbsp all-purpose flour
- 2 cups whole milk
- 1 cup low-sodium chicken broth
- 2 cups shredded sharp cheddar cheese (divided)
- 1 cup shredded mozzarella cheese
- 1/2 cup grated Parmesan cheese
- 1 tsp Italian seasoning
Directions
- Preheat your oven to 375°F (190°C) and lightly grease a 9x13-inch baking dish.
- Bring a large pot of salted water to a boil and cook the pasta for 3 minutes less than the package instructions, then drain and set aside.
- Heat olive oil in a large skillet over medium-high heat, season the diced chicken with salt and pepper, and sear until golden brown and cooked through, about 6-8 minutes. Remove chicken and set aside.
- In the same skillet, melt the butter over medium heat. Whisk in the flour and cook for 1 minute to remove the raw flour taste.
- Slowly pour in the milk and chicken broth, whisking constantly to prevent lumps, and simmer until the sauce thickens.
- Remove from heat and stir in 1.5 cups of cheddar, the mozzarella, and Parmesan until melted and smooth.
- Stir the cooked pasta and chicken into the cheese sauce until fully coated.
- Transfer the mixture to the prepared baking dish, top with the remaining cheddar, and bake for 20 minutes until bubbling and golden.
Notes
- Salt Conversion: This recipe specifies Diamond Crystal kosher salt. If you are using Morton's kosher salt, reduce the amount to 1.5 teaspoons, as Morton's is much denser and will make the dish overly salty.
- The Cheese Rule: Always grate your own cheese from a block. Pre-shredded bag cheese is coated in potato starch and cellulose to prevent clumping, which disrupts the protein matrix and prevents a smooth, velvety melt.
- Roux Workflow: Keep your heat at medium when whisking the flour and butter. Burning the flour-butter mixture will ruin the delicate dairy flavors of the sauce, so keep it moving.
- Storage Behavior: Pasta will continue to absorb sauce as it sits in the fridge. Reheated leftovers might need a splash of milk to restore the original creaminess.
Serving Suggestions
Pair this rich, comforting bake with something bright and fresh to balance the cheesy goodness.
- A crisp Watermelon Feta Salad to cut through the heavy cream.
- Savory, caramelized Roasted Cabbage Steaks for a rustic side.
- A bowl of Spicy Jalapeno Coleslaw to add a zesty, crunchy kick.
- Warm garlic bread to wipe your plate clean.
Storage and Reheating
Once the casserole cools completely, wrap the baking dish tightly in foil or transfer the leftovers to an airtight container. It will keep beautifully in the fridge for up to four days.
Do not freeze this.
The freezing and thawing process breaks the delicate dairy emulsion in the cheese sauce. When reheated, it will separate into a grainy, watery mess that no amount of whisking can save.
To reheat, place a portion in a microwave-safe bowl, splash a tablespoon of milk over the top, and cover with a damp paper towel. Microwave on medium power in 45-second bursts, stirring gently between each, until hot and creamy again.
Ingredient Substitutes
Here are a few easy swaps if you need to clear out your pantry.
- Chicken breast: Swap for chicken thighs or leftover rotisserie chicken.
- Penne: Use rigatoni, cavatappi, or even rotini.
- Cheddar: Swap for Gruyere or Fontina for a more sophisticated flavor profile.
Go ahead, tap your tongs against your hip, boil that pasta, and get this cozy bake into your oven tonight.
Susan Rosie
I've spent over 12 years perfecting recipes so you can cook with confidence. Every dish on Storied Skillet is tested multiple times – because your dinner matters. I believe in simple ingredients, clear instructions, and big flavors.
Learn More About Me →