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Creamy Mushroom Sauce

A slow-browned mushroom base and a measured cream reduction make a silky sauce with enough body to cling to a spoon.

Glossy cream sauce coats browned cremini mushroom slices with thyme in a shallow ceramic bowl.

This sauce starts by letting cremini mushrooms release their own moisture in an uncrowded skillet. Once the pan dries and their edges brown, stock and cream build a concentrated, spoon-coating finish.

Make the mushrooms the base

The sauce gets its savory depth from browned cremini mushrooms and the fond they leave behind. Cooking the mushrooms in two roomy batches gives their liquid time to evaporate before the butter helps color their edges.

Wait for the skillet to dry

At first the mushrooms soften in bubbling liquid, so adding fat immediately can leave them pale and wet. Wait until the sizzling sharpens and the pan looks dry, then add butter and let the cut surfaces take on color.

Cremini mushrooms cook in a roomy skillet as their liquid evaporates and edges brown. — Mushroom slices release moisture in a wide skillet before butter is added for browning.

Concentrate the stock first

Shallot, garlic, and thyme soften in the browned skillet before stock loosens the fond. Reducing that stock before adding cream builds flavor without asking the cream to thicken the entire sauce on its own.

Stop at a flowing spoon coat

A line drawn through the sauce on the back of a spoon should hold briefly while the sauce still pours in a slow ribbon. If it is loose, simmer gently for a little longer; if it has tightened too much, add reserved stock in small splashes.

Browned cremini edges and thyme show through a smooth glossy sauce clinging to a spoon. — Glossy cream clings to browned cremini mushrooms while the sauce remains fluid.

Creamy Mushroom Sauce

4 servings

46 minutes total

Ingredients

• 2 tbsp unsalted butter, divided
• 1 lb cremini mushrooms, brushed clean and sliced 1/4 inch thick
• 1 large shallot, finely minced
• 2 garlic cloves, minced
• 1 cup low-sodium vegetable stock, divided
• 3/4 cup heavy cream
• 1 tsp fresh thyme leaves
• 1/2 tsp kosher salt
• 1/4 tsp freshly ground black pepper

Method

Prepare the aromatics
Brush grit from the cremini mushrooms and slice them evenly. Mince the shallot and garlic, strip the thyme leaves, and measure the butter, vegetable stock, cream, salt, and pepper before heating the pan.
Look for: The mushroom slices are similar in thickness, and all aromatics are ready beside the stove.
Evaporate the first batch
Heat a wide skillet over medium-high heat until a mushroom sizzles on contact. Add half the mushrooms in an uncrowded layer and cook without butter, stirring occasionally, until they release their liquid and the pan turns dry again.
Look for: Liquid first bubbles around the mushrooms, then disappears and the sizzling becomes sharper.
Brown the first batch
Add 1 teaspoon of the divided butter to the dry mushrooms and toss to coat. Let them sit briefly between stirs until several cut edges are deeply golden, then transfer them to a plate.
Look for: The pan is no longer wet, and browned edges appear without scorching.
Brown the remaining mushrooms
Repeat the dry-cooking and browning process with the remaining mushrooms, adding the second teaspoon of butter only after their moisture has evaporated. Transfer the browned batch to the plate with the first batch.
Look for: Both batches are browned at the edges and the skillet has a thin layer of golden fond.
Soften the aromatics
Lower the heat to medium and melt 2 teaspoons of butter in the skillet. Add the shallot and cook until softened, then stir in the garlic and thyme just until fragrant, scraping lightly through the browned fond.
Look for: The shallot looks translucent at the edges and the garlic smells fragrant without browning.
Deglaze and reduce the stock
Return the mushrooms to the skillet and season with the salt and pepper. Pour in 3/4 cup of the vegetable stock, scrape up the browned fond, and simmer until the liquid is reduced by about half; reserve the remaining stock for texture adjustments.
Look for: The fond dissolves into the liquid and the stock looks concentrated rather than watery.
Simmer in the cream
Pour in the heavy cream and lower the heat so it barely simmers. Stir occasionally until the sauce coats the back of a spoon, stopping as soon as it flows in a slow ribbon instead of reducing it to a thick, heavy paste.
Look for: A line drawn through the spoon coating holds briefly, while the sauce still pours smoothly.
Adjust the consistency
If the sauce still looks loose, simmer it gently for another minute and check again. If it has become too thick, stir in reserved vegetable stock a tablespoon at a time until it returns to a smooth, spoon-coating consistency.
Look for: The sauce clings to mushrooms and a spoon without pooling like broth or sitting like paste.
Finish and serve
Take the skillet off the heat and stir in the remaining 2 teaspoons of butter until the sauce looks glossy. Taste and adjust the seasoning with the measured salt and pepper as needed, then serve warm.
Look for: The butter is fully incorporated and the sauce has a glossy, even finish.