Put the Matcha powder in a small bowl, pour two tablespoons of hot water over it, and whisk it until the Matcha is completely dissolved. If you have a milk frother, feel free to use it instead of a whisk.
Pour plant-based milk into a medium saucepan, add the diluted Matcha, the maple syrup, the cocoa butter, the cornstarch, the agar-agar powder, and the vanilla extract. Mix it together quickly so that the cornstarch dissolves.
Add the coconut cream and whisk it again. Heat over medium heat with continuous stirring until it comes to a boil. Agar-agar only dissolves when the temperature reaches 85 to 90°C, and it only sets when it cools down to 35°C, so if you skip the boiling, it will not dissolve properly and the panna cotta will be runny.
Pour the mixture into the molds, immediately distributing it into 6 small glass molds (or 4 larger ones).
Let the panna cottas cool at room temperature for at least 30 minutes before transferring them to the refrigerator. Chill for at least 4 hours, or until set, ideally overnight.
Before serving, run a knife around each panna cotta, then quickly turn them out onto a plate. Garnish with a spoonful of coconut cream and grated chocolate.