Place all ingredients together in a bowl (except the marmalade) and mix to combine.
Line a cupcake or muffin tin with cases and spoon 1 tbsp the cake mix into each.
Then add 1 tsp of the marmalade before topping with more mix.
Bake in a pre-heated oven for 15-18 minutes (170c / 150c fan) and until golden.
For the oatmeal topping
3 tbsp rolled oats
2 tbsp coconut oil
3 tbsp soft brown sugar
2 tsp orange zest
Melt together in a non-stick pot.
Transfer to a lined baking sheet and bake in the oven for 15 minutes at 200c/ 180c fan.
Allow to cool before sprinkling on top of the muffins.