Heat the oven to 200C/180C fan/gas 4. Brush half the oil in an 8-hole muffin tin. Heat the remaining oil in a frying pan and add the ham or bacon, pepper and spring onions. Fry for 5 mins. Set aside to cool.
Whisk the eggs with the milk, smoked paprika and half the cheese in a bowl. Add the cooked veg. Pour the egg mixture into the muffin holes and top each with the remaining cheese and a few chives, if you like. Bake for 15-17 mins or until golden brown and cooked through.