Butternut Squash Bread without eggs

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[...]

2 cups buttermilk 4 large eggs , separated 2 cups thawed frozen unseasoned, pureed butternut squash 1/3 cup freshly grated parmesan cheese 1 cup stone ground[...]