Mushroom Lasagna Recipe With White Sauce: Velvety Layers of Earthy Richness

This lasagna redefines comfort food with its velvety white sauce and earthy mushroom layers. I developed this version after years of perfecting the balance between richness and depth of flavor.

The key is a creamy béchamel that complements the meaty mushrooms without overpowering them. Each layer builds upon the last, creating a dish that’s both hearty and elegant.

You’ll end up with a golden-topped lasagna that’s creamy, cheesy, and packed with umami from the mushrooms. The white sauce ties everything together with a smooth, luxurious texture.

Perfect for a cozy dinner or special occasion. This is how lasagna should be made.

Ingredients for Mushroom Lasagna Recipe with White Sauce

Velvety béchamel, earthy mushrooms, and layers of golden noodles come together here.

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The mushrooms are the soul of this dish. Cremini and shiitake give that meaty, umami depth—skip the button mushrooms here. Look for firm caps with no slimy spots at the store. I grab mine from Whole Foods when they’re on sale, but any grocery store with a good produce section works. The fontina is non-negotiable for that perfect melt (the good stuff, not the pre-shredded kind).

Need to swap the wine? Vegetable broth with a splash of lemon juice works in a pinch. No fontina? Gruyère or mozzarella melt nicely too. The nutmeg in the béchamel might seem small, but skip it and you’ll miss that warmth. If you’re using regular lasagna noodles, boil them for 2 minutes less than the package says—they’ll finish cooking in the oven.

Assemble this the day before if you want—actually tastes better after 24 hours. Leftovers keep for 4-5 days in the fridge or freeze portions for 3 months. Reheat covered with foil to keep the top from drying out (worth the extra minute).

Step-by-Step Instructions for Mushroom Lasagna With White Sauce

Here’s the method I trust for perfectly layered lasagna with creamy, earthy richness every single time.

Step 1: Sauté Mushrooms and Shallots for Deep Flavor

Heat a large skillet over medium-high heat and add the 2 lb Cremini Mushrooms and 8 oz Shiitake Mushrooms with 1 tbsp of the 0.75 cup Unsalted Butter. Cook for 8-10 minutes, stirring occasionally, until the mushrooms release their liquid and it evaporates, leaving them golden brown.

Add the 2 whole Shallots (finely diced) and cook for 3-4 minutes until translucent. Stir in 6 cloves Garlic Cloves and 2 tbsp Fresh Thyme Leaves, then deglaze with 0.5 cup Dry White Wine. Simmer for 2-3 minutes until the liquid reduces by half. Season with 1 tsp Salt and 0.5 tsp Black Pepper.

Step 2: Prepare the Velvety Béchamel Sauce

In a separate saucepan, melt the remaining 0.75 cup Unsalted Butter over medium heat. Whisk in the 0.75 cup All-Purpose Flour and cook for 1-2 minutes until bubbly but not browned. This roux forms the base of your sauce.

Gradually whisk in the 4 cups Whole Milk, 1 cup at a time, ensuring each addition is smooth before adding the next. Cook for 5-7 minutes, stirring constantly, until the sauce thickens enough to coat the back of a spoon. Remove from heat and stir in 1.5 cups Parmesan Cheese, 0.25 tsp Nutmeg, and the remaining 1 tsp Salt and 0.5 tsp Black Pepper.

Step 3: Layer the Lasagna with Fontina and Mushroom Mixture

Preheat your oven to 375°F. Spread a thin layer of béchamel in the bottom of a 9×13-inch baking dish. Top with 3 pieces Lasagna Noodles (uncooked, oven-ready), then spread a third of the mushroom mixture over the noodles. Sprinkle with ½ cup Fontina Cheese and drizzle with more béchamel.

Repeat with two more layers of Lasagna Noodles, mushrooms, Fontina Cheese, and béchamel, finishing with a final layer of noodles topped with the remaining béchamel and the last of the 2 cups Fontina Cheese. This ensures every bite is rich and creamy.

Step 4: Bake Until Bubbly and Golden

Cover the baking dish with foil and bake for 25 minutes. Then remove the foil and bake for another 20-25 minutes until the top is golden brown and the edges are bubbling. The lasagna should be heated through, and a knife inserted in the center should come out hot to the touch.

Real talk: If the top browns too quickly, tent it loosely with foil again. Let it rest for 10 minutes before slicing—this allows the layers to set and makes serving easier. The aroma of thyme and mushrooms will fill your kitchen, signaling it’s ready to enjoy.

Pro Cooking Tips for This Recipe

Mushroom Prep Perfection

Don’t rush the mushroom cooking step—this is where the magic happens. I use a wide stainless steel skillet for maximum surface area. Cook the cremini and shiitake in batches if needed to avoid crowding. The key is getting them deeply browned, which develops those complex flavors. 🌡️

Béchamel Tips

Whisk constantly when adding the 4 cups whole milk to prevent lumps. If your sauce gets too thick, add a splash of milk. For extra richness, I sometimes swap 1 cup of milk for heavy cream. The nutmeg is subtle but essential—freshly grated makes all the difference.

Layering Strategy

Use oven-ready noodles to skip pre-boiling—just ensure they’re fully submerged in sauce. Spread the mushroom mixture evenly to avoid dry spots. I always finish with extra fontina on top for that golden, bubbly crust. Press down gently after each layer to eliminate air gaps.

Baking Secrets

Cover with foil for the first 25 minutes to prevent the top from drying out. Then uncover to let it brown. If your oven runs hot, check it at 20 minutes after uncovering. The lasagna is done when the edges are bubbling and the center reaches 165°F.

Resting Matters

Let it rest for 10-15 minutes before slicing—this is non-negotiable. The layers need time to set, or you’ll end up with a runny mess. I use this time to set the table and pour wine. Serving with a sharp knife helps create clean slices. 💡

Make-Ahead Hack

Assemble the lasagna in the morning, refrigerate, then bake at dinnertime. Add 5-10 minutes to the baking time if it’s cold from the fridge. This dish actually tastes better the next day as the flavors meld together overnight.

Frequently Asked Questions