Combine all ingredients for blueberry jam in a small pot. Cook on medium heat until the blueberries soften, then mash to a thick, jam like consistency. Take off heat.
In a measuring cup, combine all ingredients for pudding base and sift in the Matcha. Give it a good mix.
When blueberry jam cooled down, scoop in two tbsps into the mason jar and pour in the pudding base. Refrigerate for minimum four hours before consumption.