Prep Time 20 minutes mins
Cook Time 18 minutes mins
Resting Time 30 minutes mins
Total Time 1 hour hr 8 minutes mins
For best results, ensure all refrigerated ingredients are at room temperature so the batter mixes evenly and the cupcakes rise nicely; avoid overmixing once the dry ingredients are added to keep the crumb tender, and always add the hot water last to create that classic hot cocoa texture and flavor. Let the cupcakes cool fully before frosting to prevent the buttercream from melting, and if your kitchen is warm, chill the frosted cupcakes for 10–15 minutes to help the frosting set before serving. Adjust sweetness by using darker cocoa or reducing powdered sugar slightly, and store leftovers in an airtight container at room temperature for up to two days or refrigerated for longer, bringing them back to room temperature before enjoying.