Butternut Squash with provolone

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

2 teaspoons olive oil 3 cups chopped leeks 1 tablespoon chopped fresh sage (or 1 t. dry rubbed sage) 4 garlic cloves , minced 5 cups peeled butternut squash,[...]

1 tablespoon olive oil , plus more for pan 1/2 small butternut squash, thinly sliced (about 1 lb) 1 medium red onion , thinly sliced 1 small bunch kale ,[...]