In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, unsweetened cocoa powder, baking powder, baking soda, and salt.

In a separate bowl, combine the melted unsalted butter, large eggs, and vanilla extract. Mix until smooth, then gradually whisk in the milk.

Pour the wet mixture into the bowl of dry ingredients and gently stir with a spatula until just combined.

Preheat your oven to 350°F (175°C) and prepare your cauldron-shaped molds by greasing them lightly.

Place the prepared molds in the preheated oven and bake for 20-25 minutes, or until a toothpick comes out clean.

Once baked, remove the cauldron cakes from the oven and let them cool in the molds for 10 minutes.

Frost each cake generously with chocolate frosting and add a sprinkle of edible glitter on top.