Heat oven to 350°F. Grease the bundt pan really well with butter. Dust with flour. Shake out extra.
Beat softened butter and sugar on medium-high for 4 minutes until light and fluffy looking.
Add eggs one at a time. Beat well after each. Mix in vanilla extract and combine everything.
Whisk flour, baking powder, baking soda, and salt together in another bowl until it's all mixed.
Add flour mix and sour cream to the butter mix. Go back and forth. Start and end with flour.
Fold raspberries into batter gently with a spatula. Be careful not to squish them up too much.
Pour batter into your prepared bundt pan. Smooth the top out nicely and evenly with a spatula.
Bake 55-65 minutes until a toothpick in the center comes out clean or with just a few crumbs on it.
Cool in the pan for 15 minutes. Flip onto a wire rack. Let it cool completely before you add icing.
Heat the heavy cream until almost boiling. Pour over white chocolate chips. Wait 2 minutes. Whisk until smooth.
Drizzle warm ganache over the cooled cake. Let it drip down the sides all pretty and naturally.
Add fresh raspberries and white chocolate shavings on top if you want before the ganache sets up.