Yorkshire Pudding Casserole with Mushrooms and Thyme

Yorkshire pudding takes its name from England’s northern county, where cooks perfected a batter that billows high in sizzling fat. This casserole folds cremini mushrooms, onion, and fragrant thyme into that classic rise for a cozy vegetarian twist.

Serves 6 · 25 min prep · 45 min cook

Estimate for one serving

• 390 cal
• 16g protein
• 32g carbs
• 22g fat
• 3g fiber

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Ingredients

• 1 1/2 cups all-purpose flour
• 4 large eggs
• 1 1/2 cups whole milk
• 1 1/2 tsp kosher salt
• 1 tsp black pepper
• 1 lb cremini mushrooms
• 1 medium yellow onion
• 6 fresh thyme sprigs
• 3 garlic cloves
• 4 tbsp unsalted butter
• 2 tbsp olive oil
• 1/2 cup vegetable or beef broth
• 1 cup grated Gruyère or sharp cheddar
• 3 tbsp vegetable oil for the pan

Instructions

1. 1Slice the mushrooms and dice the onion. Heat olive oil and half the butter in a large skillet over medium-high heat. Add mushrooms in a single layer and cook undisturbed until deeply browned on one side, about 4 minutes, then stir and continue until golden and their liquid evaporates.
2. 2Add onion, minced garlic, leaves from most of the thyme sprigs, salt, and pepper. Cook until the onion softens and everything smells rich, about 5 more minutes. Splash in the broth to deglaze, scraping up browned bits, then remove from heat and stir in the remaining butter.
3. 3Whisk flour, eggs, milk, remaining salt, and pepper into a smooth batter. Rest 10 minutes while the oven preheats.
4. 4Preheat oven to 425°F. Pour the oil into a 9-by-13-inch metal baking dish and heat in the oven until smoking hot, 8 to 10 minutes.
5. 5Carefully remove the hot dish. Scatter the mushroom-thyme mixture evenly across the bottom, then pour the batter over the top in one steady stream. Sprinkle cheese evenly over the surface.
6. 6Bake 25 to 30 minutes without opening the door until the casserole is dramatically puffed the edges, golden-brown, and set in the center with crispy peaks.
7. 7Let the casserole rest 5 minutes so the custardy middle firms slightly while the crust stays crackling. Garnish with the last fresh thyme leaves.
8. 8Cut into squares and serve immediately so every portion shows the risen Yorkshire rim cradling the savory mushroom filling—the pudding is unmistakably the hero carrying the earthy thyme flavors.