Mushroom Potato Gratin

Featured in: Perfect Complements to Your Main Course

Thin layers of earthy mushrooms and tender potatoes come together with a velvety gorgonzola cream sauce, baked to perfection. Serve it for a warm and satisfying dinner, or as an indulgent side for special meals. Add a sprinkle of fresh herbs for a pop of flavor, and dig into the creamy, bold taste in every bite. Whether for a family gathering or quiet evening, this dish hits the spot every time.

A woman in a kitchen taking a selfie.
By Rosa Rosa
Updated on Mon, 12 May 2025 15:18:44 GMT
A hearty dish with potatoes and mushrooms. Pin it
A hearty dish with potatoes and mushrooms. | letscookiteasy.com

My chicken and Israeli couscous soup has turned into a filling comfort meal that I grab whenever I want something tasty but impressive. When you mix torn chicken pieces, herb sprigs, and those pearl-shaped pasta bits, you get this Mediterranean-style bowl that's both casual and fancy at once.

I whipped this up for the first time during a stormy afternoon when I needed something to make the house smell amazing. Now it's what everyone expects me to bring to potlucks, and they always want me to tell them how I made it.

Ingredients

  • Bone-in skin-on chicken thighs: they pack more flavor and stay juicy through the whole cooking time
  • Fresh parsley: gives the homemade broth its light, clean taste
  • Pearl couscous: grabs all the soup flavors but doesn't turn mushy
  • Fresh dill: brings that special Mediterranean touch that makes everything pop
  • Lemon juice: adds zip and balances the rich chicken taste
  • Seasoning salt: lets you tweak the flavor exactly how you want it
  • Olive oil: needed for cooking and finishing with that authentic Mediterranean feel

Step-by-Step Instructions

Prepare the Stock:
Grab your biggest pot and place chicken thighs flat inside. Sprinkle plenty of salt over each piece. Cover the chicken with fresh parsley to create a fragrant cushion. Add cold water until it covers the chicken by about an inch. Let it come to a gentle boil, then turn it down to a low simmer right away. Pop the lid on and let it cook slowly for 2 hours so the chicken falls apart and the broth gets super flavorful.
Strain and Shred the Chicken:
Lift each chicken thigh out with tongs and put them in a big bowl. Pour the golden liquid through a fine strainer into another bowl to catch herb bits and loose bones. Wash your pot thoroughly to get rid of any stuck-on bits. Pull off all the chicken skin and throw it away. Take two forks and pull the meat into smaller chunks while it's still warm – it's much easier this way. Drop the shredded meat back into your strained broth.
Start the Soup:
Pour some olive oil into your clean pot over medium heat till it starts to shimmer. Toss in chopped onion and celery with those flavorful celery leaves too. Cook for about 5 minutes, stirring now and then until everything turns soft but not brown. Sprinkle in your favorite seasoning salt – go easy since you can always add more later.
Simmer the Soup:
Throw the pearl couscous into the pot and keep stirring for 2 minutes to let it get a bit toasty, which makes it taste nuttier. Pour in all your chicken broth with the meat pieces. Bring everything to a gentle boil, then turn it down to simmer. Let it cook uncovered for 15 minutes, giving it a stir occasionally so the couscous doesn't stick to the bottom. The little pasta pearls will swell up and get tender as they soak up all that tasty broth. Give it a taste and add more seasoning if needed.
Finish the Soup:
Mix in the chopped fresh dill and squeeze in some lemon juice. Let these last ingredients blend with everything else for 5 more minutes over low heat. The dill will soften slightly but keep its bright green color, and the lemon will wake up all the flavors.
A bowl of food with a spoon in it. Pin it
A bowl of food with a spoon in it. | letscookiteasy.com

For me, those tiny pearl couscous balls really make this dish special. They don't get soggy like regular couscous does, even when you warm leftovers up. My grandma got me hooked on pearl couscous when I was little, and making this soup always takes me back to her kitchen that smelled like herbs and spices from the Mediterranean.

Make-Ahead Options

You can totally make this soup ahead of time. The whole thing keeps in the fridge for up to 3 days. It actually gets tastier as it sits! Just warm it up slowly on the stove, and maybe add a splash of water if it's gotten too thick. Want to save it longer? Put portions in containers with tight lids and stick them in the freezer for up to 3 months. Just let them thaw in the fridge overnight before you heat them back up.

Ingredient Substitutions

Can't find bone-in chicken thighs? Boneless ones work too, but they won't give your broth quite as much flavor. Need a shortcut? Use 8 cups of store-bought chicken broth and toss in 2 cups of torn rotisserie chicken during the last 10 minutes. Don't have pearl couscous? Try orzo pasta or small chunks of potato instead. And if you want to switch up the herbs, basil or tarragon can replace the dill for a totally different but still yummy flavor.

Serving Suggestions

This soup works as a whole meal with just a few extra touches. Serve it in wide, shallow bowls so everyone can see all the good stuff inside. Add a little drizzle of really good olive oil on top for some richness. Want some crunch? Sprinkle on some dukkah spice mix, oyster crackers, or homemade croutons. A simple green salad with lemon and olive oil dressing goes perfectly alongside. If you need something more filling, add some crusty sourdough bread for soaking up all that tasty broth.

A bowl of food with a spoon in it. Pin it
A bowl of food with a spoon in it. | letscookiteasy.com

Frequently Asked Questions

→ What’s the trick to soften the potatoes?

Thinly slicing the potatoes and baking them in cream makes them tender. Starting with foil on top ensures they soften before finishing uncovered for browning.

→ Can I use a different cheese instead?

Absolutely! Swap gorgonzola for other blue cheeses like Stilton or Roquefort. If you'd prefer something milder, try camembert or brie instead.

→ Can I prepare this in advance?

Yes, make and bake the dish beforehand, then chill it. Simply reheat it in a 350°F (175°C) oven until hot and bubbly when you're ready.

→ How should I slice potatoes for even cooking?

A mandoline slicer creates super-thin, even cuts, helping the potatoes cook consistently while giving the gratin a creamy texture.

→ What’s good to serve with this?

Try pairing it with crispy salads, roasted veggies, or a grilled protein like chicken for a balanced meal to complement the gratin.

Mushroom Potato Gratin

Rich layers of mushroom, potato, and creamy gorgonzola for ultimate comfort.

Prep Time
15 Minutes
Cook Time
120 Minutes
Total Time
135 Minutes
By Rosa: Rosa

Category: Side Dishes

Difficulty: Intermediate

Cuisine: Mediterranean

Yield: 8 Servings

Dietary: Dairy-Free

Ingredients

01 1 lemon, squeezed for juice
02 ⅓ cup fresh dill, chopped up (plus extra for toppings)
03 Water to submerge chicken
04 1 yellow onion, diced
05 Extra virgin olive oil (for a finishing drizzle)
06 1 cup pearl couscous
07 Salt and pepper as needed
08 8 chicken thighs, bone-in and skin-on
09 4 celery stalks, leaves on, chopped up
10 Your favorite seasoning salt (like garlic pepper or lemon pepper)
11 1 small bunch of parsley, fresh
12 Dukkah, saltines, or oyster crackers for garnish
13 1 tbsp olive oil

Instructions

Step 01

Toss the chicken thighs into a big pot (about 3.5 quarts). Sprinkle a lot of salt over them, then layer on the parsley. Add just enough water to cover everything. Heat it up until it boils, then turn down to a low setting. Cover the pot and leave it to simmer for two hours.

Step 02

Pull the chicken out of the pot and let it rest in a bowl. Strain the broth into a clean bowl through a fine sieve, tossing out the parsley. Rinse and wipe the pot for later use. Peel off the chicken skin and discard. Break the meat into small, bite-size chunks and return it to the strained broth.

Step 03

Use the cleaned pot and warm up olive oil over medium heat. Toss in the chopped onion and celery, cooking until they soften, around 5 minutes. Add your chosen seasoning salt, tasting and adjusting as you go.

Step 04

Mix in the pearl couscous and toast it lightly for about 2 minutes. Pour in the chicken broth (with the shredded chicken). Bring the pot back to a boil, then turn the heat down to a gentle simmer. Cook without the lid for 15 minutes or until the couscous softens. Check the seasoning and adjust with more salt and pepper as you like.

Step 05

Add the chopped dill and squeeze in the lemon juice. Let it all gently cook for another 5 minutes.

Step 06

Spoon the soup into bowls. Sprinkle over extra dill, drizzle on some extra virgin olive oil, and top with crackers or dukkah for crunch. Serve warm and enjoy the cozy dish!

Tools You'll Need

  • Big pot (around 3.5 quarts)
  • Sieve with fine holes
  • Cutting board and a sharp knife

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Includes wheat (pearl couscous)

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 290
  • Total Fat: 10 g
  • Total Carbohydrate: 26 g
  • Protein: 22 g