Muller Rice Recipe: German-Style Creamy Mushroom and Rice Casserole

This German-style casserole brings comfort food to a new level with its creamy texture and rich mushroom flavor.

I developed this recipe after trying various versions, focusing on the perfect balance between tender rice and earthy mushrooms. The dish bakes until golden and bubbling, with every bite delivering that signature creamy consistency.

The preparation is straightforward, using simple ingredients that come together beautifully. The mushrooms release their moisture, which the rice absorbs as it cooks, creating a dish that’s hearty yet refined.

Serve this as a satisfying main course or alongside roasted meats. The result is always a crowd-pleaser with its velvety sauce and tender grains.

Ingredients for Muller Rice

Rich mushrooms, creamy rice, and aromatic herbs build this hearty casserole from the ground up.

The mushrooms are the foundation. Cremini or baby bella offer the best balance of earthy flavor and meaty texture—avoid pre-sliced as they lose moisture quickly. Whole Foods or Costco carry them in bulk for larger batches. For the rice, long-grain white absorbs the liquid perfectly without turning mushy. Rinse it thoroughly to remove excess starch (worth the extra minute).

No white wine? Dry sherry or additional broth with a squeeze of lemon works well. For a non-alcoholic version, extra chicken broth with 1 tsp vinegar adds the needed acidity. Dairy-free? Swap whole milk for full-fat coconut milk and heavy cream for coconut cream. The thyme can be dried at one-third the amount, but fresh is worth the effort for this dish.

Assemble the casserole up to a day ahead—cover and refrigerate. Bake straight from the fridge (add 10-15 minutes to cooking time). Leftovers keep 4-5 days refrigerated, though the rice absorbs more liquid over time. Reheat covered with a splash of broth to restore creaminess.

Step-by-Step Instructions for German-Style Creamy Mushroom and Rice Casserole

Master this technique for a rich, velvety dish with perfectly cooked rice and mushrooms.

Step 1: Prepare the Rice and Sauté Aromatics

Rinse the 1.5 cups Long-Grain White Rice under cold water until the water runs clear. This removes excess starch and prevents a gummy texture in your finished dish. Drain thoroughly in a fine-mesh sieve.

In a large, heavy-bottomed pot or Dutch oven, melt 2 tbsp Unsalted Butter over medium heat. Add the finely diced Yellow Onion and cook for 3-4 minutes until translucent and fragrant. Stir in the minced 3 cloves Garlic Cloves and cook for an additional 30 seconds until aromatic—don’t let it brown.

Step 2: Cook Mushrooms and Build the Base

Add the sliced 1 lb Cremini Mushrooms to the pot, increasing heat to medium-high. Cook for 6-8 minutes until the mushrooms release their moisture and it evaporates, leaving them golden brown with deeply concentrated flavor.

Sprinkle the 2 tbsp All-Purpose Flour over the mushrooms and stir to coat evenly. Cook for 1-2 minutes to remove the raw flour taste. Pour in the 0.25 cup Dry White Wine and deglaze the pot, scraping up any browned bits from the bottom with a wooden spoon.

Step 3: Simmer with Creamy Liquids and Herbs

Add the 2.5 cups Chicken Broth, 1.5 cups Whole Milk, and 0.5 cup Heavy Cream to the pot. Stir in the stripped leaves from the 4 pieces Fresh Thyme Sprigs and the 1 whole Bay Leaf. Bring to a gentle simmer over medium heat.

Once simmering, stir in the drained rice, 1 tsp Kosher Salt, and 0.5 tsp Ground Black Pepper. Reduce heat to low, cover, and simmer gently for 18-20 minutes, stirring occasionally to prevent sticking. The rice should absorb most of the liquid and become tender.

Step 4: Finish and Serve

Remove the pot from heat and discard the Bay Leaf. Stir in the remaining 2 tbsp Unsalted Butter until melted. The mixture should be thick and creamy—if it’s too loose, return to low heat for 2-3 minutes to reduce slightly.

Taste and adjust seasoning if needed. Transfer to a serving dish and top with the 0.5 cup Grated Parmesan Cheese. Let rest for 5 minutes to allow the flavors to meld and the sauce to thicken further before serving. The final dish should be rich, creamy, and fragrant with the earthy depth of mushrooms and herbs.

Make-Ahead Tips for This muller rice

Overnight Assembly

You can prep this dish entirely the night before baking. Sauté the mushrooms, onions, and garlic as directed, then combine everything except the Parmesan cheese in your baking dish. Cover tightly with plastic wrap and refrigerate. 💡

Morning Bake

When ready to cook, remove from the fridge while preheating your oven to 375°F. Bake covered with foil for 30 minutes, then uncover and bake an additional 15-20 minutes until bubbling and golden.

Rice Considerations

If making ahead, use 1.6 cups rice instead of 1.5 cups since it absorbs more liquid during overnight storage. The extra 2 tbsp compensates for what the grains soak up while chilling.

Dairy Separation Fix

If your sauce looks curdled after refrigeration, don’t worry—just whisk vigorously before baking. The heat will re-emulsify everything. For extra insurance, temper the cold mixture with ¼ cup warm broth before baking.

Freezing Instructions

This casserole freezes beautifully for up to 3 months. Cool completely, then wrap individual portions in plastic wrap and foil. To reheat, thaw overnight in the fridge, then bake at 350°F for 25-30 minutes. ❄️

Reheating Leftovers

Store leftovers in airtight containers for up to 5 days. Reheat portions in the microwave with a splash of milk, covered, on 50% power for 2-3 minutes, stirring halfway through.

Frequently Asked Questions