きな粉 kinako is one of my favorite flavors. It is roasted soybean powder, so it has a sort of nutty flavor to it. Several treats come in kinako flavors, either as the powder or turned into a paste or cream.
One of my favorites is the taiyaki たい焼き (warm fish-shaped pastry) stall in the basement level of the Ryubo department store in Naha; they sell a kinako cream taiyaki.
There are also these containers of tasty kinako-covered (dried) soy beans (大豆 daizu) sold at SanA grocery store for ~100yen. They are soooo addicting. And not healthy.
While in Hokkaido I got some kinako-flavored chocolate covered beans… insanely delicious as well.
There is also a type of wagashi called warabi mochi, which is like an soft braken starch confection topped with kinako (bottom right of the dish shown in the photo below).
You can buy kinako (powder) and even kinako cream in pretty much every grocery store in Okinawa. Kinako treats are also fairly common to see around most stores; Kitkat just released a new spring flavor of sakura+kinako kitkats.