Cook bacon in large saucepan until lightly browned, add butter and onions, cook over low heat for about 5 minutes or until onions are soft.
Add flour, stir over medium heat for 1 minute.
Remove from heart, gradually add water, stock cube and potatoes, bring to boil, reduce heat, simmer, uncovered for about 10 minutes or until potatoes are cooked.
Gradually stir in combined egg yolks and sour cream, reheat without boiling.
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