Pre-heat the oven at 200C.
Sieve the flour and baking powder together in a large bowl.
Add the butter into the bowl and mix together.
Beat the egg and milk in a separate bowl and then add into the mixture, gently folding it in.
Gently fold in the blueberries.
Spoon into muffin cases and bake in the oven for 20 - 25 minutes until risen and golden.