Step 1: You will need
Preheat oven to 200C
Cream the butter and sugar together then slowly add the eggs, mix for 3 minutes. Add the flour, baking powder, blueberries, nutmeg, and refrigerate for at least an hour, preferably overnight
Put a spoonful of muffin mixture into each muffin case, filling each to just over half way
Bake in an oven for 20 minutes or until golden on top.