Dough may be made ahead of time and refrigerated over night and placed in a sealed bag or container. **Peanut butter balls should stay as cold as possible when handling with chocolate. I popped mine in the freezer as soon as I melted the candy chocolate and took 1 out at a time when coating with chocolate. Keeping the peanut butter balls very cold will ensure that they do not slip off knife. The chocolate will also set within 1 minute if they are cold.