Preheat oven to 180C/350F.
Grease a 12 hole muffin tray well with olive oil.
Cut each ham slice in half lengthways and use it to line the bottom and sides of each muffin hole.
Beat the eggs and milk together in a jug.
Put a little of the vegetables into each tin.
Pour the egg mixture evenly between each mini quiche.
Top with half a tomato and some cheese.
Bake for 25-30 minutes or until well risen and golden.
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