Preheat oven to 180 ̊C.
Place Dr. Oetker Nona Brownie Original, water, eggs and vegetable oil in a mixing bowl, mix until well combined (with wooden spatula or hand whisk).
Divide the batter into the loaf pan and bake at 170˚C for 20 minutes.
Place Dr. Oetker Nona Butter Cake Original and eggs in a mixing bowl. Mix at medium speed for 3 minutes.
Add in butter and mix at low speed for 1 minute or until batter is light and fluffy.
Spread the butter mixture over both of the brownies and bake at 180˚C for 55 minutes.
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