Occasional sitter for two children. - Full-time / Part-time

I am looking for an occasional sitter for my two children. I have a 4 year old non verbal autistic daughter and a 2 year old son so experience or willingness to work special needs is a plus. We would just need an occasional sitter for events that my husband and I go too. Sitter would just need to possibly prepare light meals or snacks and on occasion be expected to put them to bed, but other than that the primary expectation would be to watch and care for the children while we are out.