A chicken and leek pasta bake is the kind of dinner that solves a busy weeknight without asking much from you. It layers cooked pasta, seared chicken, softened leeks, and a creamy sauce under a blanket of melted cheese, then bakes until bubbly. You get a full meal from one dish with leftovers that reheat cleanly the next day.
The leeks do more than add bulk. They cook down into a mild, sweet onion flavor that balances the richness of the cream and cheese. Chicken thigh stays juicy through the bake, while the top crisps where it meets the heat. This version keeps the steps plain so you can trust the result even on a tired evening. If you enjoyed this, our no bake lemon is worth trying next. Making this chicken and leek pasta bake at home is surprisingly straightforward once you know the key steps.
Why You’ll Love These Chicken And Leek Pasta Bake
- One baking dish handles the whole meal, so cleanup stays small.
- Leeks soften into a sweet, mild base that suits picky eaters.
- Chicken thighs stay moist where lean breast often dries out.
- The cheese top crisps while the center stays creamy.
- It reheats well, making it a solid make-ahead option.
Ingredients You’ll Need
- 300 g (10.5 oz) penne pasta
- 500 g (1.1 lb) boneless skinless chicken thighs, diced
- 2 medium leeks, washed and sliced thin
- 2 tbsp olive oil
- 30 g (2 tbsp) butter
- 3 tbsp plain flour
- 500 ml (2 cups) whole milk
- 120 ml (1/2 cup) double cream
- 100 g (1 cup) grated cheddar
- 50 g (1/2 cup) grated parmesan
- 1 tsp salt
- 1/2 tsp black pepper
- 1/4 tsp ground nutmeg
Ingredient Substitutions
Chicken thighs: Replace with an equal weight of boneless skinless chicken breast if you prefer leaner meat. Breast cooks faster and dries quicker, so cut the bake time by about 5 minutes and check the center early. Expect a firmer bite and less rendered flavor in the sauce. The chicken and leek pasta bake works well for weeknight cooking when time is limited.
Double cream: Use an equal volume of full-fat crème fraîche for a tangier, slightly thicker sauce. Crème fraîche holds up to heat better than sour cream and won’t split, but it lowers the sweetness of the bake. Keep the milk amount the same to avoid a stiff mix. Storing leftover chicken and leek pasta bake correctly keeps it tasting good for days.
Leeks: Swap with 2 large sliced spring onions plus 1 small sliced onion for a sharper, lighter allium note. Spring onions cook faster, so add them in the last 3 minutes of softening to keep some color. The result is brighter but less sweet than true leeks. For the best results with this chicken and leek pasta bake, read through all the steps before starting.
Cheddar: Substitute an equal weight of gruyère for a nutty, more complex melt with better browning. Gruyère costs more and browns quicker, so watch the top in the final 10 minutes. The bake will taste less sharp and more rounded.
Pennee pasta: Use the same weight of rigatoni if penne is unavailable; its wider tubes hold more sauce inside. Rigatoni needs the same boil time but traps cheese in the centers, changing the mouthfeel. Avoid very thin pasta like angel hair, which turns soft under the sauce. For another easy option, check out our moist fudgy chocolate.
Step-by-Step Instructions
- Boil 300 g penne in salted water until just short of al dente, about 9 minutes, then drain and set aside.
- Heat 1 tbsp olive oil in a wide pan over medium-high heat and sear 500 g diced chicken thighs until the outside is golden and sealed, about 6 minutes; remove to a plate.
- Lower the pan to medium-low heat, add the remaining 1 tbsp oil and 30 g butter, then stir in 2 sliced leeks and cook until soft and lightly colored, about 8 minutes.
- Sprinkle 3 tbsp flour over the leeks and stir for 1 minute to remove the raw taste, forming a pale paste.
- Pour in 500 ml milk slowly while stirring to avoid lumps, then add 120 ml double cream and simmer until the sauce coats the spoon, about 4 minutes.
- Stir in 100 g cheddar, 50 g parmesan, 1 tsp salt, 1/2 tsp pepper, and 1/4 tsp nutmeg until the cheese melts into a smooth sauce.
- Fold the chicken and pasta into the sauce, transfer to a 2.5 litre baking dish, and spread level.
- Bake at 180°C / 350°F for 25–30 minutes until the top is golden and crispy and the edges bubble.
Pro Tips
Cut the chicken into even 2 cm pieces so every piece finishes in the same window. Uneven sizes leave some rubbery while others stay underdone.
Wash leeks by slicing then soaking in cold water; grit hides between the layers and ruins the sauce texture if skipped. Drain well before cooking to prevent splattering.
Boil the pasta 2 minutes under the box time since it keeps cooking in the oven. Overdone pasta turns to mush under the cream.
Rest the baked dish for 5 minutes before serving so the sauce thickens to a scoopable consistency. Learn proper resting from resting baked dishes for cleaner slices.
Broil for the final 2 minutes only if the top lacks color, watching closely to avoid burnt cheese. A pale top still tastes fine but looks flat.
Common Mistakes to Avoid
Overcooking the leeks until brown makes them bitter and destroys the sweet base. Keep the heat at medium-low heat and stir so they sweat, not fry.
Adding milk to hot flour fat without whisking creates lumps that stay through the bake. Pour slowly and stir constantly for a smooth sauce.
Skipping the undercook on pasta leads to a soft, gluey center. The oven continues the job, so treat the boil as partial only.
Using pre-grated cheese with starch coatings prevents a clean melt and leaves a filmy top. Grate your own for a proper golden and crispy lid.
Serving Suggestions
Plate the bake with a sharp arugula salad to cut the cream. The bitter leaves balance the cheese without extra salt.
A side of celery pasta is not needed but a plain steamed green works if you want more veg. Keep portions modest since the main dish is heavy.
Offer a squeeze of lemon at the table for those who want brightness. The acid lifts the sauce without changing the bake itself.
Storage and Reheating
Cool the dish within 2 hours and keep it in an airtight container in the fridge for up to 3 days. Reheat single portions at 180°C / 350°F until the center hits 74°C / 165°F, about 15 minutes.
You can freeze the unbaked assembled dish for up to 2 months wrapped tight. Thaw overnight in the fridge before baking as directed, adding 10 minutes if still cool.
Do not leave cooked pasta bake out past 2 hours total, including serving time, to stay food-safe. Cream and chicken both spoil quickly at room temperature.
Recipe Variations
Bacon Version
Add 100 g diced smoked bacon with the chicken sear and use the rendered fat instead of part of the oil. The bake gains a salty, smoky edge and a darker top. Expect a firmer sauce from the extra salt, so reduce added salt to 1/2 tsp.
Smoked Haddock Swap
Replace chicken with 400 g flaked smoked haddock for a seafood spin similar to leek risotto. Poach the fish first, then fold in at step seven. The flavor turns briny and the bake cooks 5 minutes less.
Gluten-Free Option
Use corn flour in place of plain flour and a gluten-free penne for the base. The sauce thickens faster, so add milk in small pours and watch the simmer. Texture stays close but the pasta bites slightly softer.
Extra Veg Build
Stir 150 g blanched spinach and 100 g peas into the sauce before baking for more color and fiber. The greens keep a bright note against the cream. Add cherry tomatoes on top for a juicy contrast.
Spicy Mustard Twist
Whisk 1 tbsp dijon mustard into the sauce at step six for a sharp background heat. Mustard cuts the dairy weight and browns the top faster. Use vodka pasta as a reference for balanced tang if unsure.
Chicken And Leek Pasta Bake
Description
A chicken and leek pasta bake layers penne, seared chicken thighs, softened leeks, and a creamy cheese sauce under a golden lid. It is a full meal from one dish with leftovers that reheat cleanly the next day.
Ingredients
Instructions
-
Boil the penne
Boil 300 g penne in salted water until just short of al dente, about 9 minutes, then drain and set aside. The pasta should still have a firm bite in the center because it will keep cooking in the oven and turn to mush if boiled fully now.
-
Sear the chicken
Heat 1 tbsp olive oil in a wide pan over medium-high heat and sear 500 g diced chicken thighs until the outside is golden and sealed, about 6 minutes; remove to a plate. The chicken is done searing when the pieces release easily and show no raw pink on the surfaces, though the center may still be slightly underdone before baking.
-
Soften the leeks
Lower the pan to medium-low heat, add the remaining 1 tbsp oil and 30 g butter, then stir in 2 sliced leeks and cook until soft and lightly colored, about 8 minutes. The leeks should be wilted, sweet, and free of brown edges, which means they sweated rather than fried.
-
Make roux paste
Sprinkle 3 tbsp flour over the leeks and stir for 1 minute to remove the raw taste, forming a pale paste. Keep the heat at medium-low and stir constantly so the flour turns blonde and does not brown or clump.
-
Build the sauce
Pour in 500 ml milk slowly while stirring to avoid lumps, then add 120 ml double cream and simmer until the sauce coats the spoon, about 4 minutes. The sauce is ready when it leaves a clear trail on the back of a spoon and gently bubbles at the edges.
-
Add cheese and season
Stir in 100 g cheddar, 50 g parmesan, 1 tsp salt, 1/2 tsp pepper, and 1/4 tsp nutmeg until the cheese melts into a smooth sauce. The mixture should be glossy and free of streaks, with the nutmeg fully dispersed for an even warm note.
-
Assemble in dish
Fold the chicken and pasta into the sauce, transfer to a 2.5 litre baking dish, and spread level. Ensure the pieces are evenly distributed so every scoop has pasta, chicken, and leeks before it goes into the oven.
-
Bake until golden
Bake at 180°C / 350°F for 25–30 minutes until the top is golden and crispy and the edges bubble. The chicken inside should reach 74°C / 165°F and the center should be steaming hot with a browned cheese lid.
Nutrition Facts
Servings 4
- Amount Per Serving
- Calories 650kcal
- % Daily Value *
- Total Fat 34g53%
- Saturated Fat 18g90%
- Cholesterol 160mg54%
- Sodium 780mg33%
- Total Carbohydrate 52g18%
- Dietary Fiber 3g12%
- Sugars 7g
- Protein 38g76%
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.
Note
- Storage: Cool the dish within 2 hours and keep in an airtight container in the fridge for up to 3 days.
- Reheating: Reheat single portions at 180°C / 350°F until the center hits 74°C / 165°F, about 15 minutes, and do not reheat the same portion more than once.
- Rest before serving: Rest the baked dish for 5 minutes so the sauce thickens to a scoopable consistency, as shown in squash pasta bake tips.
- Leek prep: Wash leeks by slicing then soaking in cold water and drain well to avoid grit and pan splatter.
