Potato and mushroom forestière gratin with creamy roasted pumpkin soup

Potato and mushroom forestière gratin with creamy roasted pumpkin soup is a medium French recipe that serves 4. 620 calories per serving. Recipe by La Cuisine de Lynoucha on YouTube.

Prep: 30 min | Cook: 2 hrs | Total: 2 hrs 50 min

Cost: $18.95 total, $4.74 per serving

Ingredients

  • 800 g Potatoes for gratin (Peeled and cut into very thin slices)
  • 2 Onion (1 for the gratin, 1 for the soup, sliced into strips)
  • 4 cuillères à soupe Olive oil
  • 30 g Butter
  • 300 ml Heavy cream (200 ml for the gratin, 100 ml for the soup)
  • 200 ml Whole milk
  • à goût Salt
  • à goût Black pepper
  • 1 pincée Nutmeg (Optional)
  • 2 Bay leaf (1 for the gratin, 1 for the soup)
  • 300 g Button mushrooms (Cleaned and sliced)
  • 3 gousses Garlic (2 for the mushrooms, 1 whole head for the soup)
  • 100 g Chicken bacon (Optional, adds smoky flavor)
  • 1 pincée Espelette pepper (Optional)
  • 1 cuillère à soupe Fresh parsley (Chopped, added at the end of cooking the mushrooms)
  • 150 g Grated cheese (mix of Gruyère, Comté, Emmental) (For gratinating)
  • 800 g Pumpkin (Peeled, seeded and diced)
  • 0.5 cuillère à café Ground cumin
  • 0.5 cuillère à café Ground turmeric
  • 0.5 cuillère à café Fresh grated ginger
  • 1 branche Fresh thyme
  • 1 branche Fresh rosemary
  • 500 ml Chicken broth (Cube or liquid)
  • 100 g Boursin (soft cheese spread) (Added to the soup to make it creamy)

Instructions

  1. Prepare all vegetables

    Peel the potatoes and cut them into very thin slices using a mandoline or a knife. Slice both onions, mince the garlic, clean the mushrooms and slice them. Dice the pumpkin, remove the seeds, and prepare the thyme, rosemary and bay leaf bouquet.

    Time: PT20M

  2. Sauté the gratin onion

    In a large pan, heat 2 c. à s. d olive oil with 15 g butter. Add the sliced onion and cook over medium heat until translucent (≈5 min).

    Time: PT5M

  3. Cook the potatoes with the onion

    Add the potato slices to the pan, season with salt, pepper and a pinch of nutmeg if desired. Sauté for 5 min over medium heat, stirring gently.

    Time: PT5M

  4. Simmer the creamy base of the gratin

    Pour 200 ml heavy cream and 200 ml milk over the potatoes, add a bay leaf, adjust seasoning and let simmer over low heat, covered, for 25 min, stirring occasionally.

    Time: PT25M

  5. Sauté the mushrooms forestière style

    In another deep pan, heat 1 c. à s. d olive oil, add the crushed garlic, the mushrooms, season with salt, pepper and, if you like, a pinch of Espelette pepper. Sauté for 5 min, then add the chicken bacon and continue cooking for 10 min until the mushroom liquid has evaporated and the mixture is nicely browned.

    Time: PT15M

  6. Assemble the gratin

    Pour half of the creamy potato mixture into the gratin dish, spread the mushroom sauté evenly, then top with the remaining potatoes. Generously sprinkle the grated cheese on top.

    Time: PT5M

  7. Final baking

    Preheat the oven to 180°C. Bake the gratin for 25 min until the cheese is nicely browned and the gratin bubbles slightly at the edges.

    Time: PT25M

    Temperature: 180°C

  8. Roast the vegetables for the soup

    Arrange the pumpkin dice, onion slices and the halved garlic head on a baking sheet. Drizzle with olive oil, season with salt, pepper and sprinkle with cumin, turmeric, ginger, thyme, bay leaf and rosemary. Roast in the preheated oven at 190°C for 35 min, stirring halfway through.

    Time: PT35M

    Temperature: 190°C

  9. Blend and heat the soup

    Transfer the roasted vegetables to a saucepan, add the chicken broth and blend with an immersion blender until smooth. Bring to a gentle boil for 5 min.

    Time: PT5M

  10. Finish the soup

    Stir in the Boursin and the remaining heavy cream, mixing until the cheese is fully melted. Heat for an additional 5 min, adjust seasoning and serve hot.

    Time: PT5M

Nutrition Facts

Calories
620
Protein
20 g
Carbohydrates
45 g
Fat
30 g
Fiber
5 g

Dietary info: gluten‑free, nut‑free, high-fiber

Allergens: milk, cheese, cream, poultry

Last updated: April 7, 2026

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Potato and mushroom forestière gratin with creamy roasted pumpkin soup

Recipe by La Cuisine de Lynoucha

A comforting meal consisting of a creamy potato and mushroom forestière gratin, accompanied by a silky roasted pumpkin soup. Ideal for an autumn lunch or dinner, this complete menu combines sweetness, forest flavors, and the warmth of pumpkin.

MediumFrenchServes 4

Shop all ingredients on Amazon in one click • Printable PDF with shopping checklist

Source Video
25m
Prep
2h
Cook
17m
Cleanup
2h 42m
Total

Cost Breakdown

$18.95
Total cost
$4.74
Per serving

Critical Success Points

  • Slice the potatoes very thinly for even cooking.
  • Reduce the mushrooms completely to avoid a watery gratin.
  • Roast the pumpkin until lightly caramelized to develop flavor.
  • Bake the gratin until the cheese is well browned and the surface bubbles.

Safety Warnings

  • Handle the mandoline with care: wear protective gloves.
  • Watch out for hot oil splatters when cooking the onions.
  • The soup liquid is very hot: let it cool slightly before blending.
  • Use kitchen gloves when removing the dish from the 180 °C oven.

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