Chips and beans is her favorite appetizer.
Informed choice between singular and plural in this case comes down to the author's view of the subject. Singular is used when the subject is thought to be served as one dish as opposed to the choice of plural in case '(c)hips and beans' are regarded as compound.
None but his supportes believe his story.
None (believe his story) but his supporters believe his story. -- The bracketed part is ellipted.
(used with a plural verb) no or not any persons or things: I left three pies on the table and now there are none. None were left when I came.
None definition | Dictionary.com
On the Great Plains, nineteenth-century settlers used mud and grass to build their homes, doing it without timber and nails.