Heat the oven to about 220°C (210°c fan). Put a Yorkshire pudding or muffin tin in the oven with a little oil in the bottom of each compartment. It needs to be hot before the batter is put in.
Put the egg, milk and flour in a mixing bowl and whisk for a moment, just to combine.
When the oven is heated up, take out the tin. Pour batter into each compartment so each one is filled half-way. Return to the top of the oven for about 20 minutes. The puddings should rise so don't open the door as they are cooking.
Serve immediately while still crisp on the outside and soft in the middle.
Vary the flavour of the Yorkshire puddings by adding herbs to the batter.Nutritional information is approximate and a guideline only.