Preheat oven to 180°C. Line a 20cm round cake pan with greaseproof paper.
Place butter in a bowl and mix at medium speed for 1-2 minutes. Fold in orange rind and continue mix for another 3-4 minutes.
Place Dr. Oetker Nona Butter Cake Original and eggs in a mixing bowl. Mix at medium speed for 3 minutes.
Add in butter mixture and orange juice, mix at low speed for 1 minute or until batter is light and fluffy. Fold in Dr. Oetker Quick Cook Oats.
Pour the cake batter into the cake pan. Bake at 180°C for 50-55 minutes.