Is it mustahabb to observe fasts in expiation for breaking an oath as the six days of Shawwaal?

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Check below answers in case you are looking for other related questions:
The days do not have to be consecutive when fasting for kafaarat al-yameen
What is kafaarat yameen in detail?

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Related Answers:
Guidelines concerning imitation of the kuffaar
Ruling on fasting the days of al-tashreeq
Fasting on Mondays and Thursdays when he owes expiation for breaking an oath
The days do not have to be consecutive when fasting for kafaarat al-yameen
What is kafaarat yameen in detail?

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