Preheat your oven to 375℉.
In the bowl of a stand mixer, cream together the butter and sugar on medium speed until light and fluffy, about 3 minutes.
Add in the eggs and vanilla and beat again until incorporated.
In a medium bowl, whisk together the flour, baking soda, and salt.
Alternate adding in the flour mixture and the buttermilk, using a spatula to fold in the ingredients between each addition.
Gently fold in the chopped frozen raspberries and white chocolate chips. Do not overmix.
Top each muffin with a generous sprinkle of turbinado sugar.
Bake for 20 minutes and let cool for 10 minutes in the pan before transferring to a rack to cool completely.