Is Your Oven Secretly Lying About Its Temperature?

Is Your Oven Secretly Lying About Its Temperature?

You did everything right. You measured the flour meticulously, creamed the butter and sugar until it was fluffy and pale, and chilled the dough for exactly one hour. You arranged your perfect shortbread cookies on the baking sheet, slid them into the preheated oven, and set a timer. Yet, when the timer dinged, you were greeted not by golden-edged perfection, but by a tray of dark brown, borderline-burnt disappointments.