Godmother’s Favorite Squash Casserole

¼-½ c. extra virgin olive oil1 Vidalia onion, chopped2 celery ribs, chopped2 T. minced garlic1 large shallot, chopped2 lbs. yellow squash, trimmed, cut into thin roundsSoftened butter1 c. Italian seasoned bread crumbs¼ c. freshly grated Romano cheese2 large eggs, beaten2…