Preheat oven to 180c.
In a jug or small bowl, combine buttermilk, vegetable oil, melted butter, vanilla and beaten egg then whisk to combine and set aside (the mixture will look a bit curdled, that's ok).
250 ml buttermilk, 60 g salted butter, 1 egg, 2 teaspoon vanilla, 4 tablespoon vegetable oil
In a large bowl place self-raising flour and raw caster sugar and whisk together to combine.
375 g self-raising (self-rising) flour, 220 g raw caster sugar
Add raspberries and white chocolate chips to the flour and mix gently to combine.
125 g raspberries (fresh or frozen), 100 g white chocolate chips
Add the buttermilk mixture to the flour mixture then fold gently until it's just incorporated - don't overmix!
Line a 12-hole muffin tin with muffin cases then divide the batter evenly between each hole and bake for 20 - 25 minutes or until a skewer inserted into the centre comes out clean.
Remove the muffins from the tin and place on a wire rack to cool.