If you ask me, one-pan bakes are a weeknight lifesaver.
This cozy chicken leek and butternut squash bake makes a hearty family dinner that’s packed with fall flavors. Tender chicken pieces nestle alongside sweet roasted squash and mild leeks in every bite.
The vegetables get soft and caramelized while the chicken stays juicy, all cooked together in one dish. A sprinkle of herbs and a drizzle of olive oil help everything come together beautifully.
It’s a comforting meal that keeps cleanup simple, perfect for those busy autumn nights.
Why You’ll Love This Chicken Leek and Butternut Squash Bake
- One-pan dinner – Everything cooks together in one dish, which means less cleanup and more time to relax after dinner.
- Healthy and nutritious – Packed with lean protein, fiber-rich vegetables, and vitamins from the butternut squash, this bake gives you a well-balanced meal that feels good to eat.
- Quick weeknight meal – Ready in under an hour, this recipe fits perfectly into busy schedules when you want something homemade but don’t have all day to cook.
- Cozy fall flavors – The sweet butternut squash paired with savory leeks and herbs creates that perfect autumn comfort food vibe that makes your kitchen smell amazing.
- Simple ingredients – Most of these items are probably already in your kitchen, and the fresh vegetables are easy to find at any grocery store.
What Kind of Chicken Should I Use?
Chicken thighs are definitely the way to go for this bake, and I’d stick with boneless, skinless ones like the recipe calls for. Thighs stay much more tender and juicy during the longer baking time compared to chicken breasts, which can easily dry out. If you can only find bone-in thighs, you can certainly use those – just add about 10-15 minutes to your cooking time and make sure the internal temperature reaches 165°F. Fresh thighs will give you the best results, but if you’re using frozen ones, just make sure they’re completely thawed and patted dry before seasoning.
Options for Substitutions
This cozy bake is pretty forgiving when it comes to swaps, so here are some options if you need to make changes:
- Chicken thighs: You can use chicken breasts instead, but keep in mind they’ll cook faster and might dry out a bit. Cut them into smaller pieces and check for doneness earlier. Chicken drumsticks work great too if you don’t mind the bone.
- Butternut squash: Sweet potato, acorn squash, or even regular potatoes make good substitutes. Just keep the pieces roughly the same size so everything cooks evenly.
- Leeks: If you can’t find leeks, use 2 large onions instead. They’ll give you a similar mild onion flavor, though not quite as sweet as leeks.
- Parmesan cheese: Gruyere, aged cheddar, or pecorino romano all work well here. Just use the same amount and grate it fresh if possible for the best melting.
- Chicken stock: Vegetable stock works fine, or you can use water with an extra bouillon cube. In a pinch, even white wine mixed with a bit of water adds nice flavor.
- Dried herbs: Fresh herbs are always welcome – use about 3 times the amount if you’re swapping dried for fresh. Rosemary or sage would be lovely alternatives to the thyme and parsley.
Watch Out for These Mistakes While Baking
The biggest mistake with this chicken and vegetable bake is not cutting your butternut squash pieces small enough – aim for 1-inch cubes or smaller so they cook through at the same rate as the other ingredients.
Another common error is overcrowding the baking dish, which leads to steaming instead of proper browning, so make sure to use a large enough dish and spread everything in a single layer when possible.
Don’t skip browning the chicken thighs first in the butter before adding them to the bake, as this step creates flavor and prevents the meat from becoming rubbery during the longer cooking time.
Finally, add the grated parmesan only in the last 15-20 minutes of baking to prevent it from burning, and always check that your chicken reaches 165°F with an instant-read thermometer before serving.
What to Serve With Chicken Leek and Butternut Squash Bake?
This hearty bake is pretty much a complete meal on its own, but I love serving it with some crusty bread or dinner rolls to soak up all those delicious juices. A simple side salad with mixed greens and a light vinaigrette helps balance out the richness of the dish and adds a nice fresh contrast. If you want something more filling, try it over rice or with some roasted potatoes on the side. The flavors are so cozy and warming that it pairs beautifully with a glass of white wine or even some sparkling water with lemon for a lighter option.
Storage Instructions
Store: This hearty chicken bake keeps really well in the fridge for up to 4 days when stored in an airtight container. The flavors actually get even better after a day or two, so it’s perfect for meal prep. Just make sure to let it cool completely before covering and storing.
Freeze: You can freeze portions of this bake for up to 3 months in freezer-safe containers. I like to divide it into single-serving portions so I can grab just what I need for lunch. Let it thaw overnight in the fridge before reheating for best results.
Reheat: Warm it up in the oven at 350°F for about 15-20 minutes until heated through, or use the microwave on medium power. If it seems a bit dry after storing, just add a splash of chicken stock before reheating to bring back that lovely saucy texture.
| Preparation Time | 15-20 minutes |
| Cooking Time | 30-35 minutes |
| Total Time | 45-55 minutes |
| Level of Difficulty | Medium |
Estimated Nutrition
Estimated nutrition for the whole recipe (without optional ingredients):
- Calories: 1100-1250
- Protein: 90-105 g
- Fat: 43-53 g
- Carbohydrates: 90-105 g
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Ingredients
For the chicken and vegetables:
- Low-calorie oil spray
- 1 1/3 lb boneless skinless chicken thighs, uncooked
- 1 tsp dried parsley flakes
- 1/2 tsp dried thyme
- Salt and ground black pepper, to taste
- 1 tbsp salted butter (or olive oil)
- 1 yellow onion, sliced
- 1 1/3 lb butternut squash, peeled and diced
- 1 tsp paprika
- 3 leeks, cleaned, trimmed, and cut into slices
- 1 tbsp chopped garlic (or 3 garlic cloves, crushed)
- 1 cup (8 fl oz) chicken broth (better than bouillon recommended)
For the topping:
- 3 oz (80 g) freshly grated parmesan cheese
- Fresh parsley leaves, chopped (about a handful)
Step 1: Prepare and Sear the Chicken
- low-calorie oil spray
- 1 1/3 lb boneless skinless chicken thighs, uncooked
- 1 tsp dried parsley flakes
- 1/2 tsp dried thyme
- salt and ground black pepper, to taste
Preheat your oven to 180°C fan (200°C/400°F/Gas Mark 6).
Cut the boneless skinless chicken thighs into thirds to make smaller pieces.
Spray a large frying pan with low-calorie oil spray and heat over medium-high.
Add the chicken pieces along with the dried parsley, dried thyme, and a generous pinch of salt and ground black pepper.
Fry the chicken until it is lightly golden on all sides, then remove from the pan and set aside on a plate.
I always make sure my pan is hot before adding the chicken for a better golden sear.
Step 2: Cook the Vegetables
- 1 tbsp salted butter (or olive oil)
- 1 yellow onion, sliced
- 1 1/3 lb butternut squash, peeled and diced
- 1 tsp paprika
- 1 cup (8 fl oz) chicken broth (Better Than Bouillon recommended)
In the same frying pan, melt the salted butter over medium heat.
Add the sliced yellow onion, diced butternut squash, and paprika.
Cook, stirring frequently, until the squash begins to soften.
Gradually add small amounts of the chicken broth, scraping the bottom of the pan to deglaze any flavorful bits left from the chicken.
This will help add depth to the dish.
Step 3: Add Leeks and Garlic
- 3 leeks, cleaned, trimmed, and cut into slices
- 1 tbsp chopped garlic (or 3 garlic cloves, crushed)
Add the sliced leeks and chopped garlic to the pan with the partially cooked vegetables.
Continue to cook for about 5 to 8 minutes, stirring occasionally, until the butternut squash is tender and the leeks have softened and developed a rich golden color.
I like to stir frequently at this stage to prevent anything from sticking to the pan and to make sure the leeks cook evenly.
Step 4: Assemble the Casserole
- vegetable mixture with leeks and garlic (from Step 3)
- seared chicken pieces (from Step 1)
- remaining chicken broth (from Step 2)
- 3 oz (80 g) freshly grated parmesan cheese
Transfer the onion, butternut squash, and leek mixture to a large ovenproof dish, spreading everything in an even layer without overcrowding.
Arrange the seared chicken pieces (from Step 1) on top, pouring over any juices collected on the plate.
Pour over any remaining chicken broth.
Sprinkle the freshly grated parmesan cheese evenly over the top.
Step 5: Bake the Casserole
Cover the dish with foil and bake in the preheated oven for 15 minutes.
After this initial bake, remove the foil and continue baking for another 15 minutes, or until the top turns golden and both the butternut squash and chicken are fully cooked.
If you want more color on top, you can broil it for the final few minutes.
Step 6: Finish and Serve
- salt and ground black pepper, to taste
- fresh parsley leaves, chopped (about a handful)
Once out of the oven, season the finished casserole to taste with extra salt and ground black pepper if desired.
Sprinkle a generous handful of chopped fresh parsley over the top before serving.
I love adding plenty of fresh parsley here for a burst of color and freshness.
Roasted Chicken Leek and Butternut Squash Bake
Ingredients
For the chicken and vegetables:
- low-calorie oil spray
- 1 1/3 lb boneless skinless chicken thighs, uncooked
- 1 tsp dried parsley flakes
- 1/2 tsp dried thyme
- salt and ground black pepper, to taste
- 1 tbsp salted butter (or olive oil)
- 1 yellow onion, sliced
- 1 1/3 lb butternut squash, peeled and diced
- 1 tsp paprika
- 3 leeks, cleaned, trimmed, and cut into slices
- 1 tbsp chopped garlic (or 3 garlic cloves, crushed)
- 1 cup (8 fl oz) chicken broth (Better Than Bouillon recommended)
For the topping:
- 3 oz (80 g) freshly grated parmesan cheese
- fresh parsley leaves, chopped (about a handful)
Instructions
- Preheat your oven to 180°C fan (200°C/400°F/Gas Mark 6). Cut the boneless skinless chicken thighs into thirds to make smaller pieces. Spray a large frying pan with low-calorie oil spray and heat over medium-high. Add the chicken pieces along with the dried parsley, dried thyme, and a generous pinch of salt and ground black pepper. Fry the chicken until it is lightly golden on all sides, then remove from the pan and set aside on a plate. I always make sure my pan is hot before adding the chicken for a better golden sear.
- In the same frying pan, melt the salted butter over medium heat. Add the sliced yellow onion, diced butternut squash, and paprika. Cook, stirring frequently, until the squash begins to soften. Gradually add small amounts of the chicken broth, scraping the bottom of the pan to deglaze any flavorful bits left from the chicken. This will help add depth to the dish.
- Add the sliced leeks and chopped garlic to the pan with the partially cooked vegetables. Continue to cook for about 5 to 8 minutes, stirring occasionally, until the butternut squash is tender and the leeks have softened and developed a rich golden color. I like to stir frequently at this stage to prevent anything from sticking to the pan and to make sure the leeks cook evenly.
- Transfer the onion, butternut squash, and leek mixture to a large ovenproof dish, spreading everything in an even layer without overcrowding. Arrange the seared chicken pieces (from Step 1) on top, pouring over any juices collected on the plate. Pour over any remaining chicken broth. Sprinkle the freshly grated parmesan cheese evenly over the top.
- Cover the dish with foil and bake in the preheated oven for 15 minutes. After this initial bake, remove the foil and continue baking for another 15 minutes, or until the top turns golden and both the butternut squash and chicken are fully cooked. If you want more color on top, you can broil it for the final few minutes.
- Once out of the oven, season the finished casserole to taste with extra salt and ground black pepper if desired. Sprinkle a generous handful of chopped fresh parsley over the top before serving. I love adding plenty of fresh parsley here for a burst of color and freshness.
