Preheat the oven to 160˚C.
Mix coffee powder and hot water to form a paste and keep aside.
Mix egg yolk and corn oil into the mixture.
Add in Dr. Oetker Nona Cocoa Powder, instant powder, egg and mix well.
Beat egg whites with sugar until soft peak and mix with coffee mixture.
Place the mixture on the 7-inch baking tray with parchment paper.
Bake at 160˚C for 30 minutes.
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Prep:10 12 slices