Creamy Mushroom Sauce

Ingredients

• 15 g (1 tablespoon)butter
• 30 ml (2 tablespoons)oil
• 500 g (5 cups)portabellini or chestnut mushrooms, halved or sliced
• 2 sprigsfresh thyme
• 2 clovesgarlic, crushed
• 240 ml (1 cup)cream
• 240 ml (1 cup)milk
• 3 teaspoonscornflour
• 15–30 ml (1–2 tablespoons)lemon juice, to taste
• to tastesalt and pepper
• 2 tablespoonschopped parsley

Instructions

1. 1

   Heat the fats

   Heat the butter and oil together in a pan.

2. 2

   Add the mushrooms

   Add the mushrooms and thyme to the pan, then season with salt and pepper.

3. 3

   Brown and flavour

   Fry the mushrooms until golden brown. Add the crushed garlic and cook until fragrant.

4. 4

   Mix the cornflour

   Whisk the cornflour into the milk until combined.

5. 5

   Simmer the sauce

   Pour in the cream and the milk mixture. Simmer gently for 5–10 minutes, until the sauce has thickened and cooked through.

6. 6

   Finish the sauce

   Season with lemon juice, salt and pepper, then stir in the parsley.

7. 7

   Serve the sauce

   Serve while warm.

What is creamy mushroom sauce?

Creamy mushroom sauce is a savoury sauce made by browning mushrooms and simmering them with dairy until the mixture thickens. This American-style version uses thyme, garlic and parsley for flavour, with lemon juice to lift the richness.

Browned mushrooms give the sauce its savoury depth, while a cornflour-and-milk mixture helps it thicken without a separate roux.

Nutrition and macros by portion

The nutrition label shows one serving as written: 132 calories, 5g protein, 11g carbs, 8g fat.

The mushrooms contribute some carbohydrates, while the milk and cream provide most of the sauce’s fat; the dairy and mushrooms also contribute protein. Serve it with a generous portion of vegetables or alongside a protein-rich main to make a more balanced plate.

Choosing and preparing the mushrooms

Mushrooms: Portabellini or chestnut mushrooms have a deep, earthy flavour and hold their shape as they cook. Halve or slice them as directed so they brown evenly.

Surface moisture: If the mushrooms are wet, dry them before cooking; excess water can slow browning and make the sauce thinner.

Build flavour in the pan

Browning: Let the mushrooms fry until golden before adding the garlic. This gives them time to colour rather than releasing moisture and steaming.

Garlic: Add it after the mushrooms have browned, as the smaller pieces cook quickly and can become bitter if left in the pan too long.

Get the texture right

Cornflour mixture: Whisk the cornflour into the milk before it goes into the pan. This helps it disperse smoothly through the liquid.

Simmer: Keep the sauce at a gentle simmer for 5–10 minutes, stirring as needed. It is ready when it has thickened and the mixture is cooked through.

Finish with balance

Lemon: Add the lemon juice to taste near the end, so you can adjust the acidity against the cream. Start with less if you prefer a milder finish.

Herbs: Stir in the parsley at the end to keep its fresh flavour. Taste once more for salt and pepper before serving.

Ways to serve it

Pasta: Toss the sauce through cooked pasta, loosening it with a little pasta water if needed.

Steak: Spoon it over grilled steak, as suggested for this recipe. It also works alongside potatoes or vegetables.

Recipe notes & tips

• Give the mushrooms room in the pan so they can brown rather than steam.
• Use a gentle simmer once the cream and milk mixture is added.
• Whisk the cornflour thoroughly into cold milk before adding it to the pan.
• Add the lemon juice gradually and taste as you go.
• Stir the parsley in just before serving for a fresher flavour.

Variations

• Add onion: Fry finely chopped onion with the mushrooms until softened.
• Use mixed mushrooms: Replace some of the chestnut mushrooms with another variety.
• Make it herby: Add chopped chives alongside the parsley.
• Add black pepper: Finish with extra freshly ground pepper for a sharper bite.
• Serve with pasta: Toss the sauce with pasta and a little pasta water to coat it.

Common mistakes to avoid

• Crowding the pan: The mushrooms may steam instead of brown; cook them in batches if needed.
• Adding garlic too early: It can burn while the mushrooms cook; wait until they are golden.
• Skipping the cornflour whisk: Lumps can form; blend it into the milk before pouring.
• Boiling the dairy: A hard boil can make the sauce less smooth; keep it at a gentle simmer.
• Adding all the lemon at once: The sauce may become too sharp; add it gradually and taste.

How to store

Refrigerate leftovers in a covered container for up to 3 days. Reheat gently in a pan, stirring often; add a splash of milk if the sauce has thickened too much.

Frequently asked questions