Info on the KS
From The Spruce:
it’s more of a roasted soybean but it can translate into a powdered [grainy] taste of roasted peanut butter. (Milk and honey too will come in handy, but is not a must for powdered PB)
The powder PB I am talking on, looks like this from the store::
by adding the kinako soy to the peanut butter with milk, it will pick up the grainy aspect of the KS and turn it into a powdered version. At least my tongue translates it to that. 
Pretty good reading, and some fun to tinker with, if you have the flavors. 