Tapping the toolbox (Level 4+ I think) will sometimes net you the first level of the toaster (it looks like a blue board with two metal bars on top of it), and once you merge that up to Level 6 it'll get you a toaster, which will spawn bread slices in any free space next to it. Merge those to make sandwiches. Hope this helps!
Comment found on Mergedom: Home Design: Anyone know how to make...
Issue fixed. To allow toaster to make sandwiches they need to have free space around.
Comment found on Mergedom: Home Design: How do I make a...