"But" is a coordinating conjunction connecting two independent clauses. The sentence structure is [Clause 1][Comma][Coord. Conjunction][Clause 2]. There is no comma that follows the coordinating conjunction.
hotenhornay
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A member registered Jun 26, 2021
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No, that is not a safe rule of thumb. If there were another clause between "but" and "she prepared it masterfully", one would need a comma. (e.g. "It was quite a simple dish, but, as she'd done many times before, she prepared it masterfully.")
As it stands, however, an additional comma would be incorrect.