Smear some oil all around the cups of 2 bun tins. Sprinkle some flour on to a work surface and unroll the pastry. Flatten it with the balls of your hands. Stamp circles out of the pastry with a cutter and place each circle in a cup of the tin, gently pressing it down with your fingertips.
Place the eggs and milk in a measuring jug and beat with a fork.
Put the ham, spring onions and cherry tomatoes in a bowl and mix together. Put a dessertspoonful of the mixture into each pastry cup.
Pour some of the egg and milk mixture into each cup. Sprinkle some Cheddar over the top. Bake the quiches in a preheated oven, 220°C (425°F), Gas Mark 7, for 20 minutes or until set and golden. Serve the quiches hot or cold.