Steam new potatoes about 20 minutes or until fork-tender. Combine peas, salt and sugar in a saucepan and add water to cover. Cook uncovered, 5-8 minutes, or until tender (if using frozen peas it may take less time). Drain; return peas to pan.
Add butter and green onions to peas. Heat until butter is melted. Add potatoes, pepper, and cream. Heat through, but do not cook.