Preheat the oven to gas 5, 190ºC, fan 170ºC. Line a muffin tin with 12 paper muffin cases. Sift together the flour and baking powder in a large bowl.
Mix in the sugar, ½tsp salt, 75g (3oz) cheese, ham, sundried tomatoes and chives.
In another bowl, beat together the eggs, buttermilk (or milk) and oil and pour over the dry ingredients. Stir until just combined, fill the muffin cases and sprinkle the tops with the remaining cheese. Bake for 20-25mins until risen.
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