Nymphs Just Wanna Have Fun - S5-E19
Corrected entry: When Paige rearranges the kitchen Piper asks what was wrong with the old system that had worked for the last five years. But when Piper became a neat freak in episode 5-13, 'House Call', she alphabetised all the ingredients in the kitchen, which was not five years before.
Correction: When Piper was referring to the old system, she was talking about the disorderly system that they had before. Not the alphabetized system, which they probably abandoned after the spell wore off in House's Call.