Sheet cookies vary so much that it is nearly impossible to give a single procedure for all of them. Some of them are almost like sheet cakes, only denser and richer; they may even be iced like sheet cakes. Others consist of two or three layers added and baked in separate stages. The following procedure is only a general guide.
- Spread cookie mixture into prepared sheet pans. Make sure the thickness is even.
- If required, add topping or brush with an egg wash.
- Bake as directed. Cool.
- Apply icing or topping, if desired.
- Cut into individual squares or rectangles. Best practice is to turn the sheet out onto a board ( for unmolding sheet cakes) before cutting to avoid damaging the sheet pans.