Instant Pot Creamy Mushroom and Barley Sauce

Name: Instant Pot Creamy Mushroom and Barley Sauce
Prep time: 15 min
Cook time: 18 min
Total time: 33 min
Yield: 4 servings
Cuisine: American
Ingredients: 2 tablespoons (30 ml) olive oil; 1 pound (450 g) cremini and/or button mushrooms, cleaned and sliced ¼ inch thick; 4 cloves garlic cloves, minced; ¾ cup (150 g) pearl barley; 2½ cups (600 ml) vegetable broth; 2 leaves bay leaves; 3 sprigs fresh thyme sprigs; ¾ cup (180 ml) sour cream, at room temperature; 1½ tablespoons (12 g) cornstarch; 1 tablespoon (15 ml) Dijon mustard; 3 tablespoons (9 g) fresh dill, chopped, roughly chopped; kosher salt; freshly ground black pepper

From the MyKitchenBank Kitchen

A silky Polish-inspired sauce combining pearl barley, sautéed mushrooms, and tangy sour cream, finished with fresh dill. Made in the Instant Pot for tender, flavorful barley in under 30 minutes. Perfect over egg noodles, mashed potatoes, or rice—comfort food at its finest.

Prep: 15 min
Cook: 18 min
Wait: 12 min
Total: 45 min
Makes: About 3 cups sauce (serves 4 as a side or pasta topper)

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Steps

Before you start

Have all ingredients prepped and within reach before you start—sauté time is quick
Use fresh mushrooms for best flavor; avoid using powdered dill as a substitute
Read through both sauté and pressure-cook steps to understand the full process

1
Sauté mushrooms and garlic
- Set your Instant Pot to sauté mode on high heat.
- Once the display shows hot, add the olive oil.
- When the oil shimmers (about 1 minute), add the sliced mushrooms in a single layer and let them sit undisturbed for 3 minutes to develop color.
- Stir and cook for another 2–3 minutes until the mushrooms release their liquid and begin to turn golden.
- Add the minced garlic and cook for 1 minute until fragrant.
- Season lightly with salt and pepper.
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Ready when: Mushrooms are golden and tender, garlic is fragrant
Tip: Don't crowd the pan—let mushrooms brown before stirring so they develop depth of flavor, not steam.
2
Add barley and broth
- Pour in the vegetable broth, scraping any browned bits from the bottom of the pot with your wooden spoon.
- Stir in the pearl barley, bay leaves, and thyme sprigs.
- Cancel sauté mode and seal the lid.
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Ready when: Ingredients are combined and liquid covers the barley
Tip: Scraping the bottom prevents the pot from detecting a burn error when you pressurize.
3
Pressure cook barley
- Set the Instant Pot to high pressure for 10 minutes.
- The pot will take about 3–4 minutes to come to pressure, then cook for 10 minutes.
- When the timer beeps, allow the pressure to release naturally for 5 minutes, then carefully quick-release any remaining pressure by turning the valve to vent.
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Ready when: Barley is soft and creamy but still holds its shape; liquid is mostly absorbed
Tip: Natural release allows residual heat to gently finish cooking the barley without toughening it.
4
Make sour cream slurry
- While the barley cooks, whisk together the room-temperature sour cream, cornstarch, and Dijon mustard in a small bowl until smooth and lump-free.
- This prevents curdling when added to the hot sauce.
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Ready when: Mixture is smooth with no cornstarch lumps
Tip: Bringing sour cream to room temperature prevents it from curdling when mixed into hot liquid.
5
Temper and stir in sour cream
- Open the Instant Pot and discard the bay leaves and thyme sprigs.
- Set the pot to sauté on medium heat.
- Slowly pour the sour cream mixture into the hot sauce while stirring constantly.
- Continue stirring for 2–3 minutes until the sauce thickens slightly and is creamy throughout.
- The cornstarch will cook out any raw starch taste.
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Ready when: Sauce is creamy, smooth, and coats the back of a spoon; no raw cornstarch smell
Tip: Stir constantly to prevent lumps and ensure even heating. If sauce breaks, gently whisk in 2 tablespoons of broth off heat to smooth it.
6
Finish and season
- Remove from heat and fold in the fresh chopped dill.
- Taste and adjust seasoning with salt and pepper to your preference.
- The sauce should be rich, tangy, and herbaceous.
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Ready when: Dill is evenly distributed and sauce smells bright and fresh
Tip: Add dill after heat to preserve its fresh color and aromatic oils.

Good to know

Tips

For deeper mushroom flavor, use a mix of cremini, oyster, or shiitake mushrooms. Avoid watery button mushrooms alone.
This sauce is excellent over buttered egg noodles, creamy mashed potatoes, or steamed rice. It also pairs beautifully with roasted vegetables.
If your sauce breaks or curdles, remove from heat and whisk in 2–3 tablespoons of cold broth to smooth it out. Heat gently before serving.
Make this vegetarian-friendly by using vegetable broth; for a deeper umami flavor, add 1 tablespoon of soy sauce or tamari in the final seasoning step.

Make ahead

Prepare mushrooms and garlic up to 4 hours ahead and store covered in the fridge. The finished sauce can be made up to 2 days ahead; store in an airtight container in the refrigerator. Reheat gently on the stovetop over medium-low heat, stirring often and thinning with a splash of broth if needed. Freeze in ice cube trays or a freezer bag for up to 3 months; thaw overnight in the fridge and reheat before serving.

Storage & reheating

Room temperature: do not leave longer than 2 hours. Refrigerator: 3–4 days in an airtight container. Freezer: up to 3 months; thaw overnight and reheat gently on stovetop over medium-low heat, stirring occasionally and adding broth if too thick.

Substitutions

pearl barley → farro or diced potatoes (use same quantity). Farro adds a chewy texture; potatoes will be softer and more delicate but work well in this sauce.
sour cream → crème fraîche or Greek yogurt. Crème fraîche adds elegance; Greek yogurt makes it tangier but slightly less creamy. Both handle heat similarly.
fresh dill, chopped → 1 tablespoon fresh parsley plus ½ teaspoon caraway seeds. Caraway echoes Polish flavors; adds a subtle spice if you don't have fresh dill on hand.
Dijon mustard → 1 teaspoon whole grain mustard. Whole grain adds texture and a slightly less sharp flavor. Reduce to ½ teaspoon if you prefer milder mustard flavor.