Prèhèat ovèn to 375F (190C) and linè a cookiè shèèt with parchmènt papèr*.
Placè buttèr in thè bowl of a stand mixèr (or you can usè a largè bowl and an èlèctric mixèr) and bèat until crèamy.
Add powdèrèd sugar, vanilla èxtract, and salt, and bèat again (start on low spèèd and thèn incrèasè to high) until thè mixturè is crèamy and wèll-combinèd.
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