#Excel VBA, 40 Bytes
Anonymous VBE immediate window function that takes no input and outputs to the ActiveSheet object
[A1:Z26]="=Char(Max(Column(),Row())+64)"
#Excel VBA, 40 Bytes
Anonymous VBE immediate window function that takes no input and outputs to the ActiveSheet object
[A1:Z26]="=Char(Max(Column(),Row())+64)"