Preheat the oven 190°c (170 fan/ 375F/ Gas 5) and line a 12 hole muffin tin with muffin cases.
Mix together the caster sugar, plain flour and bicarbonate of soda in a large mixing bowl.
140 g Caster Sugar, 200 g Plain White Flour, 1 teaspoon Bicarbonate of Soda
In a jug mix together the natural yogurt, eggs, melted butter and vanilla extract with a whisk.
100 ml Natural Yogurt, 2 Eggs, 140 g Butter, 1 teaspoon Vanilla Extract
Pour the wet ingredients into the dry ingredients and gently combine. Be careful not to over mix. It doesn't matter if the mixture is a bit lumpy.
Fold in the blueberries and white chocolate chips and then divide the batter between the 12 muffin cases.
150 g Blueberries, 100 g White Chocolate Chips
Bake in the oven for 18 minutes but start checking after 16 minutes.