Responses

https://www.mangago.zone/read-manga/tonari_no_metaller_san/
https://www.mangago.zone/read-manga/hatsukoi_no_tonari/
This is the only neighbor ones I can think of but there’s some other ones where they aren’t neighbors and one cooks for other
it was one where the mc or ml cooked food for his neighbour who was either in high school or college. it was bl, and i forgot the rest.