Sweet potatoes and potatoes skin are very nutritious.  Buy organic and so you can eat them!  

Ingredients:

• organic sweet potatoes
• organic potatoes
• cottage cheese (avoid low fat)
• whole milk
• unsalted cultured butter
• minced garlic (optional)

Wash and scrub the sweet potatoes and potatoes well.  Steam them with skin until soft.  Put them in a large bowl along with other ingredients.  Mash them well.