The term BAKING AID can be summarized by the crossword solution SHEET, which is a five-letter word. A SHEET is a flat, thin object used for a variety of purposes, including baking. It is often used to line baking pans and trays to prevent sticking and to provide an even surface for baking. Sheets are also used to roll out dough and to shape pastries. In baking, sheets are usually made of metal, silicone, or parchment paper.