Squash of any kind has a plethora of vitamins and minerals as well as fiber and antioxidants. In fact, one cup of cooked squash has more than 50% of your recommended daily allowance of vitamin C and over 450% of your daily needs of vitamin A. Butternut squash also does not have any saturated fat or cholesterol. It is also a good source of potassium, beta-carotene, magnesium, niacin, and folate.