Heat oven to 200C/fan 180C/gas 6.
Mix together the self-raising and plain flour, baking powder, bicarbonate of soda, salt and mustard powder in a bowl.
In a separate bowl, mix the cheese, oil, yogurt, milk, egg and Worcestershire sauce.
Combine all the ingredients and divide between the muffin cases in the muffin tin.
Place in the oven for 20-25 mins until golden. Remove and cool slightly on a rack.
What you need: Ask the kids to help get everything ready, weighing scales, measuring jug, fork, 2 mixing bowls, 12 paper muffin cases, muffin tin, cheese grater, sharp knife, tablespoon, cooling rack.