Heat oven to 220C/200C fan/gas 7. In a bowl, beat the flour and mustard
powder with the eggs until you have a smooth, thick batter. Gradually beat in the milk until the batter is the same consistency as single cream, then stir in the herbs, and season.
Pour a drizzle of oil into each hole of a sturdy 12-hole muffin tin. Put the tin in the oven and heat for 5 mins. Working quickly, remove the tin and pour enough batter into each hole so that it comes two-thirds of the way up the sides. Carefully place the tin back in the oven and cook the puddings for about 20 mins until they are puffed up and brown.