Butternut Squash Casserole with onion

3 1/2 pounds butternut squash peeled and cut in 1/4-inch-thick slices (about 6 cups) 1 bunch spinach fresh, washed and stemmed, optional 2 tablespoons butter,[...]

1 butternut squash 1 cup quinoa 1 1/2 cups water 1 teaspoon salt 1 tablespoon olive oil , divided 4 garlic cloves , minced 4 shallots , diced 1 cup mushroom ,[...]