Creamy Amish Mushroom and Barley Casserole

Imperial October 25, 2026October 25, 2026

Quick Recipe Version (TL;DR)

Amish Creamy Mushroom and Barley Casserole is an Amish-inspired farmhouse dinner with tender pearl barley, browned mushrooms, fresh thyme, and a lightly crisp breadcrumb topping.

Yield: 6 main-course servings
Prep Time: 20 minutes
Cook Time: 1 hour 45 minutes
Total Time: 2 hours 15 minutes, including 10 minutes of resting

Quick Ingredients

1 1/2 cups (300 g) dry pearl barley, rinsed and drained
1 pound (454 g) cremini mushrooms, sliced 1/4 inch thick
1 medium yellow onion, diced, about 1 cup (150 g)
3 garlic cloves, minced
4 tablespoons (56 g) unsalted butter, divided
1 tablespoon (15 ml) olive oil, divided
3 1/2 cups (840 ml) low-sodium vegetable broth, plus up to 1/2 cup (120 ml) if needed
1/2 cup (120 ml) heavy cream
2 teaspoons fresh thyme leaves, plus 1 teaspoon for optional garnish
1/2 teaspoon fine salt and 1/2 teaspoon freshly ground black pepper
3/4 cup (45 g) panko breadcrumbs
Optional: 3/4 cup (85 g) shredded vegetarian Swiss cheese

Do This

1. Heat the oven to 350°F (175°C). Grease a 9-by-13-inch, approximately 3-quart baking dish with 1 teaspoon of the olive oil.
2. Brown the mushrooms in two batches, using 1 tablespoon butter and 1 teaspoon oil per batch, about 5 minutes each. Return all mushrooms to the pan; cook the onion for 5 minutes, garlic and thyme for 1 minute, then barley for 1 minute.
3. Stir in 3 1/2 cups broth, cream, salt, and pepper. Bring to a gentle simmer over about 3 minutes, then transfer to the baking dish and cover tightly with foil.
4. Bake covered for 70 minutes, until the barley is tender with a pleasant chew. If still firm, add 1/4 cup broth if needed, cover, and bake for another 10–15 minutes.
5. Melt the remaining 2 tablespoons butter and toss with the breadcrumbs.
6. Uncover the casserole, sprinkle with optional Swiss cheese, and add the buttered breadcrumbs. Bake uncovered for 15 minutes, until lightly golden.
7. Rest for 10 minutes, garnish with the optional thyme, and serve warm.

Why You’ll Love This Recipe

Deep mushroom flavor: Browning the mushrooms first gives the whole casserole a rich, savory backbone.
Comforting without being heavy: A modest amount of cream makes the barley creamy while letting its nutty flavor shine.
A satisfying vegetarian dinner: Serve generous spoonfuls with a crisp green salad or roasted vegetables.
Wonderful texture: Tender, pleasantly chewy grains meet a delicate, buttery breadcrumb crust.

Grocery List

Produce: 1 pound cremini mushrooms, 1 medium yellow onion, 3 garlic cloves, and 1 small bunch fresh thyme.
Dairy: Unsalted butter, heavy cream, and optional Swiss cheese made with vegetarian or microbial rennet.
Pantry: Pearl barley, low-sodium vegetable broth, olive oil, panko breadcrumbs, fine salt, and black pepper.

Full Ingredients

For the Mushroom and Barley Casserole

1 tablespoon (15 ml) olive oil, divided: 1 teaspoon for the baking dish and 2 teaspoons for the mushrooms
2 tablespoons (28 g) unsalted butter, divided between the mushroom batches
1 pound (454 g) cremini mushrooms, trimmed and sliced 1/4 inch thick
1 medium yellow onion, finely diced, about 1 cup (150 g)
3 garlic cloves, minced, about 1 tablespoon
2 teaspoons fresh thyme leaves
1 1/2 cups (300 g) dry pearl barley, rinsed under cool water and drained well
3 1/2 cups (840 ml) low-sodium vegetable broth
1/2 cup (120 ml) heavy cream
1/2 teaspoon fine salt
1/2 teaspoon freshly ground black pepper
Up to 1/2 cup (120 ml) additional vegetable broth, only if needed during baking

For the Topping

2 tablespoons (28 g) unsalted butter, melted
3/4 cup (45 g) panko breadcrumbs
Optional: 3/4 cup (85 g) shredded Swiss cheese made with vegetarian or microbial rennet
Optional garnish: 1 teaspoon fresh thyme leaves

Creamy Amish Mushroom and Barley Casserole – Closeup

Step-by-Step Instructions

Step 1: Prepare the oven and baking dish

Position a rack in the center of the oven and preheat to 350°F (175°C). Grease a 9-by-13-inch, approximately 3-quart baking dish with 1 teaspoon of the olive oil. Rinse the pearl barley in a fine-mesh strainer under cool running water, then drain thoroughly. Have the remaining ingredients measured before you start cooking.

Step 2: Brown the mushrooms in batches

Heat a wide, 12-inch skillet over medium-high heat. Add 1 tablespoon butter and 1 teaspoon olive oil. Once the butter has melted, add half the mushrooms and spread them into an even layer. Cook for 5 minutes, stirring occasionally, until they have released moisture and developed golden-brown edges. Transfer to a bowl.

Repeat with the remaining 1 tablespoon butter, 1 teaspoon olive oil, and mushrooms, cooking for another 5 minutes. Browning in batches helps the mushrooms sauté rather than steam.

Step 3: Soften the onion and toast the barley

Reduce the heat to medium. Return the first batch of mushrooms and any collected juices to the skillet. Add the onion and cook for 5 minutes, stirring frequently, until softened. Stir in the garlic and 2 teaspoons thyme leaves and cook for 1 minute.

Add the drained barley and stir for 1 minute, coating the grains in the buttery mushroom mixture. The barley should look glossy; it does not need to brown.

Step 4: Add the broth and cream

Pour in 3 1/2 cups vegetable broth and the heavy cream. Add the salt and pepper, scraping the bottom of the skillet to release any browned bits. Bring to a gentle simmer over approximately 3 minutes; avoid a vigorous boil.

Carefully transfer everything to the prepared baking dish and spread the barley and mushrooms evenly through the liquid. Cover the dish tightly with foil so the barley can absorb the broth without drying out.

Step 5: Bake until the barley is tender

Bake, covered, for 70 minutes. Carefully lift the foil away from your face and taste a few grains from the center. They should be tender with a pleasant chew, not hard or chalky. The mixture should still look moist and creamy, with a little loose liquid between the grains.

If the barley is still firm, cover and bake for another 10–15 minutes. If the mixture also looks dry, stir in 1/4 cup (60 ml) additional broth before covering. Repeat once if necessary, using no more than the reserved 1/2 cup broth. Barley brands and baking dishes can vary, so tenderness matters more than the clock.

Step 6: Prepare the buttered breadcrumbs

While the casserole bakes, melt the remaining 2 tablespoons butter in a small saucepan over low heat or in a microwave-safe bowl. Toss with the panko until the crumbs are evenly coated. Keep the topping separate until the barley is tender so the crumbs stay on the surface rather than soaking into the liquid.

Step 7: Add the topping and finish baking

Remove the foil. If using Swiss cheese, scatter it evenly over the barley, then sprinkle the buttered breadcrumbs over the top in a light, even layer. Bake uncovered at 350°F (175°C) for 15 minutes, until the topping is lightly golden and the edges are gently bubbling.

Step 8: Rest and serve

Let the casserole stand for 10 minutes before serving. This allows the barley to absorb the last little bit of liquid while keeping the center creamy. Scatter with the optional 1 teaspoon fresh thyme leaves and serve in generous spoonfuls. A green salad with a sharp vinaigrette makes a lovely fresh contrast.

Pro Tips

Use pearl barley: Hulled barley needs more time and liquid, while quick-cooking barley can turn mushy with this baking schedule.
Keep the foil snug: A tight seal is important. Escaping steam can leave the grains dry before they soften.
Look for creamy, not soupy: Before adding the topping, the barley should be tender and surrounded by a small amount of creamy liquid. The uncovered bake and resting time will thicken it further.
Choose the right cheese: For a fully vegetarian casserole, use Swiss labeled as made with vegetarian or microbial rennet.
Allow a little timing flexibility: The listed total assumes the barley is tender after 70 minutes covered. Older barley or a heavy baking dish may require the additional covered baking time.

Variations

Mixed-mushroom casserole: Replace the cremini with 1 pound total of sliced cremini, stemmed shiitake, and oyster mushrooms. Brown them in the same two batches.
Add some greens: Stir 2 cups (60 g) baby spinach into the softened onion and mushrooms. Cook for 1–2 minutes until wilted before adding the garlic and thyme.
Dairy-free version: Replace all 4 tablespoons butter with plant-based butter, use 1/2 cup unsweetened oat cooking cream instead of heavy cream, and omit the Swiss. Check that your breadcrumbs are dairy-free.

Storage & Make-Ahead

Refrigerate: Transfer leftovers to shallow, airtight containers and refrigerate within 2 hours of cooking. Store for up to 4 days. The barley will absorb more moisture as it sits.

Reheat: Add 1–2 tablespoons vegetable broth per serving, cover, and warm in a 350°F (175°C) oven for approximately 25–35 minutes, depending on the portion size, until the center reaches 165°F (74°C). Uncover for the final 5 minutes to help refresh the topping.

Freeze: Freeze cooled portions in airtight containers for up to 2 months. Thaw overnight in the refrigerator before reheating. The breadcrumb topping will soften, but the casserole will still be delicious.

Prep ahead: Cook the mushrooms, onion, garlic, and thyme up to 2 days ahead, stopping before adding the barley. Cool promptly and refrigerate. On baking day, warm that mixture in the skillet for 3–4 minutes, then continue with the barley, broth, and cream. Add the breadcrumbs only for the final uncovered bake.

Nutrition (per serving)

Estimated for one-sixth of the casserole, without the optional Swiss cheese or extra broth. Values vary with the broth and breadcrumb brands used.