01 - Preheat oven to 350°F. Grease and line an 8-inch square baking pan.
02 - In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, baking soda, and salt until well combined.
03 - Add buttermilk, oil, egg, and vanilla to the dry mixture. Mix until smooth, then pour in hot water and mix again until fully incorporated.
04 - Pour batter into prepared pan. Bake for 25-30 minutes until a toothpick inserted in center comes out clean. Allow to cool completely.
05 - While cake cools, whip heavy cream with powdered sugar, vanilla, and cream cheese until medium-stiff peaks form. Keep chilled.
06 - Break cooled chocolate cake into small crumbles by hand or with a fork.
07 - In clean flower pots or dessert cups, layer crumbled cake, creamy filling, another layer of cake crumbs, then generously top with chocolate cookie crumbs to resemble soil.
08 - Arrange edible flowers, mint leaves, and herb sprigs on top to create a whimsical garden effect.
09 - Refrigerate assembled desserts for at least 30 minutes to set flavors and achieve best texture.