Preheat oven to 350 degrees F.
Combine flour, cocoa, baking powder, and salt. In another bowl, whisk oil, sugar, vanilla, and eggs. Blend both mixtures together and pour into a greased baking pan.
Bake for 25 minutes. Cool brownies while making frosting.
In a sauce pan, combine chocolate chips, cocoa powder, oil, miso, corn syrup, and salt. Heat over a medium flame until just melted. Whisk until smooth.
Pour miso frosting over cooled brownie and smooth to the edges. Decorate with fruit and flowers.