Preheat the oven to gas mark 6/200°C (180°C in a fan oven)
Combine the flour, oats, sugar, baking powder and bicarb in a bowl. Whisk the Jaffa orange zest and juice, oil, yogurt, and egg together with a fork, then lightly stir the 2 mixtures together until combined
Spoon 1 tbsp of the mixture into each muffin case, top with 1 tsp of marmalade, then cover with the remaining muffin mix and a sprinkling of oats
Bake for 15-20 mins until cooked through and golden, then leave to cool slightly
