Add the matcha, cinnamon, and kinako to a wide, medium-size bowl and stir them together. If you don't have a matcha whisk or a handheld frother, you can use a sieve to sift the powders together to ensure there are no lumps.
Chop the white chocolate and place it in another large bowl. Add the pinch of salt.
Heat the milk until it is just on the edge of boiling, then pour it into the bowl with the white chocolate. Let it sit for 30-60 seconds before stirring.
Heat the water until boiling, then pour it into the bowl with the matcha mixture, using the matcha whisk, frother, or whisk to mix it until there are no lumps and the tea is frothy.
Make sure all of the white chocolate has melted, then pour the tea mixture into the hot chocolate. Use a long whisk (not the matcha whisk) to mix the two liquids together until they are well combined.
To serve, you can top with whipped cream and sprinkle with the matcha, cinnamon, and kinako powders.
