Start by preheating your oven to 350°F (180°C) and lining a 12-cup muffin tin with cupcake liners.This is one of those small steps that makes everything smoother. There’s nothing worse than having your batter ready and realizing you forgot the liners (we’ve all been there). In a large bowl, whisk together: flour, cocoa powder, baking powder, baking soda, salt, sugar
Take a second to break up any cocoa powder lumps it helps your cupcakes bake evenly and keeps the texture nice and smooth.
Add the Wet Ingredients: egg, oil, milk. Whisk until everything is well combined and smooth.At this stage, the batter will look thick and rich like a classic chocolate batter. Now carefully stir in the hot water.
Divide the batter evenly between your cupcake liners.
Bake for 18–20 minutes, or until a toothpick inserted into the center comes out clean.
Let the cupcakes cool on a wire rack.