Preheat the oven to 180C, 360F, and gas 6

First, you need to prepare the topping by rubbing together the flour, demerara, and butter until you have a crumb like texture.

To make the muffins, mix together the milk, vegetable oil, vanilla extract and beaten egg.

Add the sugar, flour, baking powder, and salt, mix for a moment, just enough to moisten the flour, giving you a lumpy batter, keeping it slightly lumpy will ensure lighter muffins once cooked.

Fold in the blueberries and then divide the mixture between your muffin cases filling them a good two thirds full.

Scatter the streusel mixture over the top of each muffin and then put in the oven to cook for 20-25 minutes, until they are golden.

Once cooked, cool slightly before leaving to cool further on a wire rack.

Serve and Enjoy!