For the crust, pulse every ingredient in a food processor until well processed, but still slightly crumbly. Press mixture into the base of the springform plan that has been lined with parchment paper.
For the mango layer, in a blender or a food processor, place every ingredient and blend well until smooth. You may have to split this part of the recipe in half and do this in batches depending on the size of your food processor. Taste and add more sweetener if needed. Layer the mango filling above the base. Cool in freezer until set.
For the matcha layer, in a blender or a food processor, place every ingredient and blend well until smooth. Taste and add more sweetener if needed. Layer the matcha filling above the base. Cool in freezer until set.
At least 4 hours prior to serving, take out of freezer and remove the cake from the springform pan to defrost. Sift matcha powder on top and garnish with yellow, blue, purple and green edible toppers, such as pansies, frozen blueberries, lemon slices, and mint.