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Combine butternut squash puree with milk, Parmesan cheese, nutmeg and thyme until you get creamy consistency. Season with salt to taste.
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FOR WHITE SAUCE:
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Heat flour in an empty saucepan just until hot. Remove from heat. Add oil and whisk. Add cold milk and whisk vigorously to avoid forming of clumps.
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Return to heat and cook, stirring, until thickened. Add grated nutmeg and season with salt and white pepper. Add cottage cheese (or ricotta cheese), grated cheese and mix to combine.
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TO ASSEMBLE LASAGNA:
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Spread a little bit of white sauce across bottom of the oiled baking pan (8x5x2 inches, 4 cups volume or 22×12.5×5 cm, 950 ml volume) just to cover the bottom. Top with noodles and spread some butternut squash mixture over noodles. Top with another layer of noodles and spread a layer of white sauce over it. Continue layering: noodles – squash – noodles – sauce until you use all ingredients. Finish with white sauce.
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Cover with aluminum foil and bake in 350F (175 C) oven for about 20 minutes. Remove the foil and bake for 20 minutes more or until cooked through.