Creamy Vegan White Sauce Lasagna Recipe

Vegan white sauce lasagna layers sautéed onions, mushrooms, and spinach in a silky vegan white sauce and finishes with a sprinkle of vegan parmesan. This version swaps traditional butter and flour béchamel for a creamy, plant-based cashew cream, making it comforting, flavorful, and entirely vegan.

For me, comfort food often means layers of tender pasta and vegetables bathed in a rich, creamy sauce. While red-sauce lasagna is a classic, this vegan white sauce lasagna offers a lighter, yet indulgent alternative. It combines savory mushrooms, sweet caramelized onions, and bright spinach with a luscious cashew-based sauce that browns slightly at the edges when baked. It’s a crowd-pleaser that works well for weeknight dinners and special occasions alike.

What is Bechamel Sauce?

Béchamel is the classic white sauce traditionally made from butter, flour, and milk. In this recipe, we recreate that creamy mouthfeel using plant-based ingredients: a sautéed onion and wine base combined with blended cashews (or suitable substitutes) and vegetable broth. The result is a smooth, savory white sauce—without dairy or gluten—perfect for layering in lasagna.

I developed this lighter, vegan version after trying a restaurant rendition and adapting it so it’s gluten-free and dairy-free. The family loved it so much I had to make it again soon after. It’s a versatile, comforting dish that showcases simple vegetables inside a rich, dairy-free sauce.

White Lasagna Ingredients

• Garlic: Use fresh cloves for the brightest, most aromatic flavor.
• Mushrooms: Crimini mushrooms work well, but button or shiitake are fine too.
• White onion: When cooked, white onion softens and sweetens, forming a great base.
• Spinach: Fresh spinach wilts quickly into the warm vegetables; organic is recommended.
• Fresh basil: Adds a fragrant, herby lift to the vegetable layer.

Start by preparing the filling. Sautéed mushrooms and onions form a savory base; garlic and basil add depth. Add the spinach last so it wilts quickly and retains color. Set the mixture aside to cool while you make the white sauce.

Vegan Bechamel Sauce Ingredients

• White onion and shallot: Sautéed to create a flavorful base for the sauce.
• Garlic: Fresh cloves for best flavor.
• Dry white wine: Adds acidity and depth; cook briefly to reduce the alcohol.
• Raw cashews: Blended with broth to make a silky cream. (See substitutions below for nut-free options.)
• Vegetable broth: Used to thin and flavor the sauce; divided amounts are noted in the recipe.
• Dijon mustard: Contributes a gentle tang and helps emulsify the sauce.
• Nutritional yeast: Adds a savory, cheese-like note and helps thicken the sauce.
• Garlic powder and onion powder: For rounded, consistent seasoning.

Sauté the shallot and onion, add wine and reduce, then blend cashews with broth, nutritional yeast, mustard, and seasonings in a high-speed blender. Return the reduced onion-wine mixture to the pan and whisk in the blended cashew cream. Heat gently until the sauce thickens, then remove from the heat and let it rest while you assemble the lasagna.

Vegan Bechamel Sauce Ingredient Substitutions

• Use yellow onions or leeks in place of white onion.
• Substitute shallots with finely chopped red onion if needed.
• Replace white wine with a splash of lemon juice or additional vegetable broth if you prefer no alcohol.
• For a nut-free white sauce, use silken tofu, cooked white beans, or a flour-based roux with plant milk or extra vegetable broth.
• Stone-ground mustard works in place of Dijon; miso, tamari, or soy sauce can replace nutritional yeast for savory depth.
• One medium garlic clove ≈ 1/4 teaspoon garlic powder; about 1 tablespoon fresh onion ≈ 1 tablespoon onion powder.

When the blended cashew mixture is added to the warmed onion and wine reduction and whisked over medium heat, it thickens into a creamy sauce perfect for layering.

• Place 1/2 cup of vegetable broth in the bottom of a 9 x 13-inch pan to keep noodles from sticking and to help them finish cooking.
• Arrange a first layer of lasagna noodles, overlapping slightly to cover the base.
• Spoon a thin layer of the white sauce over the noodles, then add a layer of the mushroom-spinach mixture.
• Repeat layers—noodles, sauce, vegetables—until the pan is filled, finishing with sauce on top.

• Finish with a sprinkle of vegan parmesan across the top for a bit of crunch and savory flavor.

Prepare Immediately or Make Ahead

• Bake covered at 350°F for 25 minutes, then uncover and bake an additional 10 minutes until the top is lightly golden.
• You can assemble, cover, and refrigerate the lasagna until you’re ready to bake—perfect for meal planning.
• To develop deeper flavor, bake ahead of time, cool completely, refrigerate overnight, and reheat before serving.

I served this lasagna with a large green salad and a tangy Italian-style dressing for contrast. It pairs nicely with crisp greens, roasted vegetables, or simply a light bowl of soup.

Recipe FAQs

Tips

• Store leftovers covered in the refrigerator for up to 3 days.
• To reheat, bake covered at 350°F (175°C) for about 30 minutes until heated through.
• To freeze, bake fully, cool, cut into portions, then wrap and freeze. Thaw completely before reheating.
• For a nut-free version, use blended white beans or silken tofu in place of cashews.

Next time you want comforting Italian flavors with a plant-based twist, try this vegan white sauce lasagna. It’s rich, satisfying, and a welcome change from the usual tomato-based lasagna.

Great Vegan Italian Recipes

If you enjoyed this vegan white lasagna, please leave a review and share your feedback in the comments — we’d love to hear how yours turned out!

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