Preheat the oven to 160C /150C Fan Oven /Gas 4

Line a muffin tin with cases.

Melt the margarine in microwave and set aside to cool.

Sieve flour and baking powder into a bowl and stir in the sugar.

Rinse the blackberries thoroughly.

Beat the eggs.

Add milk to the margarine and then add eggs and vanilla extract. Stir well.

Add the milk mixture to the flour and sugar and mix well.

Fold the blackberries into the mixture.

Pour the mixture into the muffin cases using a jug or ladle.

Bake for 20 minutes until golden.

Cool on a wire rack.