This is my favourite recipe for sweet potato treats for dogs with food allergies.
4 Large Sweet Potatoes
Pierce the sweet potatoes with a fork and bake them in a 350 degree oven for 30 to 40 minutes.
Hollow out the sweet potatoes and mash and mix with olive oil. You may add extra if they do not get really creamy.
Place baking paper on a cookie sheet and spread the mash over the sheet about 3/4 of an inch thick. Make the edges a bit thicker as they tend to burn.
Bake this in a 300 degree oven for 30 to 45 minutes — do not let it burn. Remove from oven and allow to cool.
Break off pieces and store in an airtight container.