• Preheat your oven to 350°F (180°C), and grease a loaf pan to get it ready.
• In a 20cm x 6cm loaf pan, which holds about half as much as a standard 8 x 4 inch one—so if you're using the bigger size, just double the ingredients!
• In a bowl, whisk together the coffee, oil, vanilla extract, and sugar until smooth. Sift in the flour, cocoa powder, and baking powder, then gently fold everything together until just combined.
• Pour the batter into your prepared pan and bake for about 50 minutes, or until a toothpick poked in the center comes out clean.
• Once it's done, let the loaf sit in the pan for 5 minutes, then carefully transfer it to a wire rack to cool completely.

Sweet potato frosting

• Pop all the ingredients into a bowl and mix them together, adding a little more milk if needed to get things moving. You’re aiming for a smooth, frosting-like texture—not too runny!
• Once it’s just right, let it chill in the fridge until you’re ready to use it.
• When your loaf has cooled, go ahead and decorate it however you like!