1
: Preheat oven to 375ºF (190C). Grease and line a 15”x10” (40cm x 25cm) jellyroll pan with parchment paper, overlapping it on the 2 longer sides for easy removal.
2
: Place flour and sugar in a large mixing bowl. Reserve.
3
: Bring butter, water, cocoa powder and coffee granules to a boil in a saucepan. Remove from heat and add to flour mixture. Beat until well combined. Add next 6 ingredients and beat well. Stir in white chocolate. Spread batter evenly over prepared pan.
4
: Bake in preheated oven 17-20 minutes or until a toothpick inserted into center of cake comes out clean.
: Icing:
5
: Meanwhile place milk, butter and cocoa powder and in a medium saucepan over medium heat. Stir until butter has melted. Add vanilla and icing sugar. Stir on low heat until melted and combined. Immediately spread over hot cake.