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Heat oven to 200C/180C fan/ gas 6 and line a muffin tin with 9 paper cases. Combine the flour, oats, sugar, baking powder and bicarb in a bowl. Whisk the orange zest and juice, oil, yogurt and egg together with a fork, then lightly stir the 2 mixtures together until just 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.