In a large heat proof bowl melt butter & chocolate together over a double boiler or microwave & mix until well combined
Add sugar, vanilla extract, coffee and oil
mix until well combined
Now add eggs & whisk well
Add all purpose flour,cocoa powder, baking powder & salt. Mix until well combined
Add hot water & mix well. Batter is ready now
Preheat the oven at 180c for 15 min
Pour the batter in the prepared baking pan & bake at 180c for 50-60min or until the tooth pick inserted in the center comes out clean
Remove from the oven and cool completely