Butternut Squash Lasagna without vegetables

itemscope itemtype="http://data-vocabulary.org/RecipeIngredient"> Cooking spray 3 cups chopped onion 10 cup fresh spinach 3/4 cup (3 ounces) shredded sharp[...]

12 lasagna noodles 1 large butternut squash, about 3 lbs 2 tablespoons olive oil , divided 1/2 teaspoon salt 3 tablespoons butter , divided 2 cups chopped[...]

1 tablespoon olive oil 1 1/2-2 lbs butternut squash , peeled, seeded, and cut into 1-inch cubes 1/2 teaspoon salt 1/4 teaspoon fresh ground black pepper 1/2[...]