01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt until well combined.
03 - Add cold butter cubes. Cut in with a pastry cutter or fingertips until mixture resembles coarse crumbs with pea-sized butter pieces remaining.
04 - In a separate bowl, whisk together heavy cream, egg, and vanilla extract until blended.
05 - Pour wet ingredients into dry mixture. Stir gently with a spatula until just combined. Do not overmix—some flour streaks should remain visible.
06 - Gently fold in raspberries and white chocolate chips. Expect some raspberries to break apart slightly, which will create swirls throughout the dough.
07 - Turn dough onto a lightly floured surface. Gently pat into an 8-inch circle about 1 inch thick. Cut into 8 equal wedges and transfer to prepared baking sheet, leaving space between each scone.
08 - Brush tops lightly with extra cream. Bake for 16-18 minutes or until golden brown on top and cooked through. Cool on wire rack for at least 10 minutes.
09 - Whisk together powdered sugar, milk or cream, and vanilla extract until smooth and drizzle-consistency. Add additional liquid 1 teaspoon at a time if too thick, or more powdered sugar if too thin.
10 - Drizzle glaze over cooled scones. Allow glaze to set for 5 minutes before serving. Best enjoyed warm or at room temperature on the same day.