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Heat the oven to 200C/180C fan/gas 6 and line a eight-hole muffin tin with muffin cases. Coarsely grate the courgette into a fine sieve and use clean hands to squeeze out as much liquid as possible over the sink. Tip into a bowl with the spring onions, flour, roasted red pepper, most of the cheese and the rosemary, along with lots of black pepper and a pinch of salt.
Crack the eggs into a jug, pour in the oil and top up with enough milk to make 300ml. Beat together, then pour into the courgette mixture and mix to a smooth batter. Divide between the cases, top with the remaining cheese and bake for 25-30 mins until risen, firm and golden brown on top. Leave to cool completely on a wire rack. Will keep for up to three days in an airtight container in the fridge.