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 2 or 3 layers added and baked in separate stages. The procedure is a general guideline only:
- Spread the 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 any.
- Cut into individual squares or rectangles.