- Preheat oven to 350F (175C). Grease and flour a 9x13 inch baking pan. 
- In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. 
- In a large bowl, cream together the butter and sugar until light and fluffy. 
- Beat in the eggs one at a time, then stir in the vanilla extract. 
- In a small bowl, whisk together the buttermilk and melted white chocolate. 
- Gradually add the dry ingredients to the wet ingredients, alternating with the buttermilk mixture, beginning and ending with the dry ingredients. Mix until just combined. 
- Gently fold in the crushed freeze-dried strawberries. 
- Pour the batter into the prepared pan and spread evenly. 
- Bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean. 
- Let the cake cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely. 
- Optional: Dust with powdered sugar or top with a white chocolate glaze. 
- Tips & Substitutions: For a more intense strawberry flavor, increase the amount of freeze-dried strawberries to 1 1/2 cups. If buttermilk is unavailable, a mixture of 1 cup milk with 1 tablespoon of lemon juice or white vinegar, allowed to sit for 5 minutes, can be used as a substitute.