The recipe below is for the basic version. I'll often add ingredients to the squash mixture, such as sauteed greens, onions and/or mushrooms. Just make sure to use something soft so it doesn't upset the texture.

Butternut Squash Lasagna recipe:
Butternut Squash, 1 large or 2 small to medium- cooked and mashed til
creamy (I slice in half, lightly cover with oil and bake for apx 1 hr, til
pierces with fork easily)
Béchamel Sauce:
Butter 2 tbsp
Onion, raw, 1 medium
Flour, whole grain, 2 tbsp
Milk 1.5 cup
Spices to taste (Nutmeg, etc)
Lasagna noodles (~12 pieces) for a 9x11x3 pan: cooked, rinsed and cooled
Mozzarella 12-16 oz shredded
For sauce:
Thinly slice onion. Set milk out so comes to room temperature. In a
saucepan, melt butter and sauté onions until they are slightly
caramelized. Add flour and mix well. Slowly add warm milk and stir or
whisk to prevent clumps, add nutmeg/spices. Continue to stir as sauce
thickens. Set aside.
Line the lasagna pan with 1/3 of the béchamel sauce.
Layer with noodles.
Spoon half of the squash over the noodles and top with 1/3 of the cheese.
Layer with noodles.
Top with 1/3 of the sauce.
Spoon over the remaining squash and 1/3 of cheese.
Layer with noodles.
Spread remaining sauce over noodles, top with remaining cheese.
Bake covered approximately 1 hour on 375 degrees. Uncover and bake another
15 minutes or until top is browned.
