Butternut Squash and Cheddar Casserole with sprinkles

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 lb pizza dough, thawed if frozen cornmeal 1 lb butternut squash, peeled, seeded, and sliced 1/4 inch thick 1/2 red onion , thinly sliced 1/4 cup pine nuts 1[...]