Butternut Squash Red Pepper Casserole is a delightful sweet and savory side dish that will soon become a favorite with your family. This easy recipe includes butternut squash and red bell peppers. It’s flavored with garlic, rosemary, parsley and Parmesan cheese to bring out a rich, dramatic, sumptuous flavor that can’t be beat. This fantastic casserole is perfect for holidays like Thanksgiving, Christmas or Easter. Everyone will want seconds. Gluten free.