Preheat the oven to 375°F/192°C.
Grease a mini doughnut pan.
Carefully place one cherry blossom into the each doughnut cavity. Set aside.
Add the wilted greens to a blender with 2 tablespoon of water. Blend until smooth. You should have about ¼ C of liquid. (If omitting the greens, use ¼ C milk in its place).
In a large bowl, add the blended green liquid (or ¼ C milk) to the bowl, along with the egg, oil, sugar and vanilla extract. Beat together until combined.
Sift the cake flour, matcha, salt, and baking powder into a large bowl.
Pour the wet ingredients over top of the dry ingredients and fold gently until combined,
Transfer the mixture into a piping bag, cut the tip, and pipe the batter into the doughnut cavity, about ¾ full.
Bake at 375°F/192°C for 6-7 minutes, until they spring back when touched lightly.
Let the doughnuts cool in the pan for at least 5 minutes before removing.
Transfer to a cooling rack with a piece of parchment paper underneath.