Cut your sweet potatoes into chunks.......

In a large pot melt your margarine or butter.......

Place cut up sweet potatoes and sliced onion into pot, sauté until potato is slightly tender and onion is wilted......

Add to pot your chicken broth or stock, white pepper, ground nutmeg and cinnamon powder, heat to boiling........Continue to cook until sweet potatoes are tender and broth has been reduced slightly......At this point you can add a little bit of salt if you like.......

Reduce heat and add in your heavy cream, heat on low heat for several minutes.......