To make a sandwich, you must have a max-level toaster.
Please tap on your tool box to spawn level-1 toaster parts. Merge the toaster parts to the highest (6th) level. Then, the toaster will start to produce bread slices. 🍞 You can merge your bread slices and make a sandwich. 🍔
If your toaster doesn't spawn bread slices, please make sure that you have empty tiles on and around it.