Place 2 in. of water in a large saucepan; add sweet potatoes. Bring to a boil. Reduce heat; cover and simmer for 7-9 minutes or until tender. Drain and set aside.
In a skillet, saute onions in butter until tender. In another large saucepan, combine the flour, curry powder, salt and pepper. Gradually stir in the milk until smooth. Add the sweet potatoes and onions. Bring to a boil; cook and stir for 2 minutes or until thickened. Stir in peas and cream; heat through (do not boil).