This chicken and leeks recipe is the kind of one-pan dinner that looks like you spent all afternoon in the kitchen but comes together in about 45 minutes flat. Each serving packs 54 grams of protein, which means you actually feel full after dinner instead of rummaging through the pantry an hour later. I first made this on a random weeknight when I had two leeks sitting in the fridge about to give up on life, and it stopped my teenagers mid-argument at the dinner table. That’s basically a five-star review in my house.
There is something about tender chicken simmered in a mustardy, creamy leek broth that just works. This chicken and leeks recipe is rich without being heavy, simple without being boring, and versatile enough to become a pie filling, pasta sauce, or soup base depending on what you need that night.
Table of Contents
Ingredients for Chicken and Leeks
I keep this ingredient list short on purpose the leeks and mustard do most of the heavy lifting here, and I never want a recipe that requires a grocery run for three specialty items on a Tuesday night. I always use low-sodium chicken stock so I can control the saltiness myself, and I pull the sour cream out of the fridge about ten minutes before I need it so it blends in without seizing up.
- 4 boneless chicken breasts (pounded flat to approximately 1/4 inch thickness for even cooking)
- 1 tbsp olive oil, plus extra for the leeks my go-to is a light extra-virgin
- Salt and pepper to taste
- Juice of 1/2 lemon
- 2 leeks, quartered lengthways and roughly chopped – pro tip: rinse every single layer under cold running water; leeks hide grit between the layers and sandy broth is not something you want to discover at dinner
- 1 clove garlic, finely chopped (or 2 tsp garlic paste I usually keep paste on hand for busy nights)
- 2 tbsp all-purpose flour
- 2 cups chicken stock or broth in my experience, low-sodium gives you the best control over the final seasoning
- 1/2 cup milk
- 1 tsp ground mustard
- 3 tbsp sour cream I recommend bringing this to room temperature before stirring it in
- 1 handful fresh tarragon leaves (optional, but genuinely worth it if you can find it)
Step-by-Step Instructions
In my experience, two things make or break this dish: flattening the chicken before it hits the pan and adding your stock slowly while stirring. Skip either one and you will feel the difference at the table.
Step 1: Wrap each chicken breast in plastic wrap and pound with a rolling pin to about 1/4 inch thickness. This step is optional but highly recommended it cuts down on dry edges and produces noticeably more tender chicken. The first time I skipped it I ended up with one overcooked end and one undercooked center, and I have not skipped it since.
Step 2: Drizzle olive oil over both sides of the chicken and season generously with salt, pepper, and lemon juice on each side.
Step 3: Place the chicken in a large frying pan over medium-high heat. Sear for 2 to 3 minutes per side until deeply golden brown. Do not move the chicken while it is searing or it will not develop that crust. Remove from the pan and set aside on a plate.
Step 4: Add a little extra olive oil to the same pan. Add the chopped leeks and cook over medium heat, stirring regularly, until softened about 4 to 5 minutes. Add the garlic and stir for another 60 seconds until fragrant.
Step 5: Stir in the flour and cook for about 1 minute, stirring constantly until the leeks are fully coated. This creates a simple roux that thickens the broth naturally and prevents the lumpy sauce situation nobody wants.
Step 6: Gradually pour in the chicken stock and milk, about half a cup at a time, stirring constantly after each addition. Rushing this step is the most common mistake take your time and the broth will be silky smooth.
Step 7: Once the broth begins to simmer, return the seared chicken breasts to the pan. Cover with a lid and cook for 20 minutes. The chicken finishes gently in the broth, which keeps it moist all the way through. Check that the thickest breast reads 165°F internally before moving on.
Step 8: Remove the lid and reduce the heat to low. Stir in the ground mustard and sour cream until fully smooth. Do not let the sauce boil after adding the sour cream or it may split. Taste and adjust salt, pepper, and mustard to your preference.
Step 9: Fold in fresh tarragon leaves if using. Serve immediately.
What to Serve with Chicken and Leeks
The creamy mustard broth in this dish is rich and savory, so the best sides either soak it up or cut through it with something bright. Here are my favorite pairings for the best sides for chicken and leeks:
Mashed Potatoes: This is the classic pairing and for good reason. Fluffy mashed potatoes absorb that mustardy broth perfectly and turn the whole plate into serious comfort food. If you want a protein-boosted version, try the technique from this Creamy Garlic Cheesy Chicken and Potatoes and apply it to your mash.
Steamed Broccoli or Green Beans: A bright green vegetable cuts through the richness of the cream sauce and keeps the meal balanced. The Lemon Garlic Butter Chicken and Green Beans Skillet uses a similar flavor profile if you want inspo on how to season them.
Boiled New Potatoes: A lighter alternative to mash the thin skins hold their shape and soak up just enough broth without making the plate too heavy.
Roasted Carrots: Their natural sweetness plays against the savory mustard notes in the broth in a way that feels intentional. The Honey Garlic Chicken and Sweet Potato post has a great roasted vegetable technique you can borrow.
Pasta: Stir the leftover chicken and leek broth through cooked pasta for a completely different and equally delicious meal. The High Protein Creamy Roasted Red Pepper Pasta is a great reference for building creamy pasta sauces if you want to stretch this further.
Chicken and Leek Pie: Pour the entire pan into a pastry-lined dish, top with puff pastry, and bake at 400°F for 20 to 25 minutes. If you love creamy chicken bakes, you will also want to bookmark this High Protein Chicken Pot Pie for a similar cozy vibe.
Crusty Bread: On the nights when you just want to drag good bread through that sauce, go for it. A thick slice of sourdough turns this into a full experience with zero extra effort.
Storage and Serving Tips
Store leftovers in an airtight container in the refrigerator for up to 3 days. The flavor actually deepens overnight, which makes the next day’s lunch something worth looking forward to.
To reheat, warm gently on the stovetop over low heat, stirring occasionally. Avoid bringing it to a boil after the sour cream has been added high heat will cause the sauce to split and turn grainy. A slow, gentle reheat keeps everything smooth.
This chicken and leeks recipe is also surprisingly flexible as leftovers. Pour it over pasta with a splash of extra stock, use it as a filling for a quick chicken and leek pie, or add more broth and blend part of it for a creamy soup. Freezing is not recommended because the dairy-based sauce changes texture after thawing, but honestly leftovers in this house never make it that far.
Conclusion
This chicken and leeks recipe is the kind of dinner that quietly earns a permanent spot in your weekly rotation. It is easy enough for a Wednesday night, impressive enough for company, and rich in protein without tasting like a health food compromise. Once you taste that creamy mustard broth, you will understand why this pan never makes it to the fridge without someone scraping the edges first. Give it a try and let me know how it turns out.
Chicken and Leeks
Equipment
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Large frying pan with lid
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Chopping board
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Plastic wrap
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Rolling Pin
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Instant-read meat thermometer
Ingredients
- 4 boneless chicken breasts pounded flat to approximately 1/4 inch thickness
- 1 tbsp olive oil plus extra for cooking the leeks
- salt and pepper to taste
- 0.5 lemon, juiced
- 2 leeks quartered lengthways and roughly chopped, rinsed thoroughly between all layers
- 1 clove garlic finely chopped, or 2 tsp garlic paste
- 2 tbsp all-purpose flour
- 2 cups chicken stock or chicken broth low-sodium recommended for best seasoning control
- 0.5 cup milk
- 1 tsp ground mustard
- 3 tbsp sour cream bring to room temperature before adding to prevent curdling
- 1 handful fresh tarragon leaves optional
Instructions
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Wrap each chicken breast in plastic wrap and pound with a rolling pin to approximately 1/4 inch thickness. This ensures even cooking and more tender results.
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Drizzle olive oil over both sides of the chicken and season with salt, pepper, and lemon juice on each side.
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Place the seasoned chicken in a large frying pan over medium-high heat. Sear for 2 to 3 minutes per side without moving until golden brown. Remove and set aside on a plate.
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Add a little extra olive oil to the same pan. Add the chopped leeks and cook over medium heat, stirring regularly, until softened, about 4 to 5 minutes. Add the garlic and stir for 60 seconds until fragrant.
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Stir in the flour and cook for 1 minute, stirring constantly, until the leeks are fully coated. This creates the roux that thickens the broth.
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Gradually pour in the chicken stock and milk about half a cup at a time, stirring constantly after each addition to prevent lumps and create a smooth, silky broth.
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Once the broth begins to simmer, return the seared chicken breasts to the pan. Cover with a lid and cook for 20 minutes. Verify the thickest breast reaches an internal temperature of 165°F before proceeding.
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Remove the lid and reduce heat to low. Stir in the ground mustard and room-temperature sour cream until smooth and fully incorporated. Do not allow the sauce to boil at this stage or the sour cream may split.
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Fold in fresh tarragon leaves if using. Taste and adjust salt, pepper, and mustard to your preference. Serve immediately.
