Savory Chestnut & Mushroom Bake
Earthy chestnuts and meaty mushrooms baked together in a rich, herb-scented custard. This cozy casserole has a golden, slightly crisp top and a creamy, tender center. Perfect as a vegetarian main or a hearty side dish for holiday meals.
For 4 servings
- prep
Preheat the oven and prepare the baking dish.
1.Preheat the oven to 375°F (190°C).2.Grease the baking dish lightly with a little butter. - saute · ~13 min
Sauté the mushrooms and aromatics.
1.Melt the butter in a large skillet over medium-high heat.2.Add the chopped onion and cook until softened, about 4 minutes.3.Add the sliced mushrooms and cook until they release their liquid and start to brown, about 8 minutes.4.Stir in the garlic and fresh thyme, cooking for 1 more minute until fragrant.5.Season with a pinch of salt and black pepper. Remove from heat.TIPDon't crowd the pan — cook mushrooms in a single layer so they brown instead of steam. - mix · ~2 min
Prepare the custard mixture.
1.In a mixing bowl, whisk together the eggs and heavy cream until smooth.2.Stir in the remaining salt, nutmeg, and half of the grated Gruyère cheese. - assemble · ~3 min
Assemble the bake.
1.Fold the cooked mushroom mixture and the chopped chestnuts into the custard until evenly coated.2.Transfer the mixture to the greased baking dish and spread evenly.3.Sprinkle the breadcrumbs and the remaining Gruyère cheese over the top. - bake · ~35 min
Bake until golden and set.
Bake in the preheated oven for 30 to 35 minutes, or until the top is golden brown and the custard is set with a slight wobble in the center.
TIPIf the top browns too quickly, tent loosely with foil during the last 10 minutes. - rest · ~10 min
Rest before serving.
Let the bake rest for 10 minutes to set completely.
- garnish
Garnish with fresh parsley and serve.
Scatter the chopped parsley over the top and serve warm.
What to keep in mind.
5 tips from the recipe — small details that make a real difference to the final dish.
- 1Cook mushrooms in a single layer without stirring for deeper browning.
- 2Taste a chestnut before adding — if bland, roast them lightly to concentrate flavor.
- 3Let the bake rest exactly 10 minutes so the custard firms up for clean slices.
- 4Use freshly grated nutmeg — pre-ground lacks the aromatic punch this dish needs.
- 5Make ahead: assemble without topping, refrigerate, then add breadcrumbs and bake.
Adapt it for your goals.
Vegan
Replace eggs with 2 tbsp flaxseed meal + 6 tbsp water, use coconut cream instead of heavy cream, and swap Gruyère for vegan cheese or omit — for a plant-based holiday main.
low oilLow-oil
Sauté mushrooms and onions in a nonstick pan with a splash of vegetable broth instead of butter, and use panko without added oil — reduces fat while keeping texture.
Why this is on our healthy list.
Rich in Selenium
Cremini mushrooms provide selenium, an antioxidant that supports thyroid function and immune health.
Good Source of Complex Carbs
Chestnuts offer slow-release energy and fiber, unlike most nuts, making this bake more satisfying as a main dish.
Frequently asked questions
Yes, thaw and pat dry before chopping — excess moisture can make the custard watery.
