01 - Preheat oven to 350°F. Grease a 9-inch round cake pan and line with parchment paper.
02 - Whisk together flour, ground pistachios, baking powder, and salt in a bowl. Set aside.
03 - Beat butter and sugar in a large bowl until pale and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in vanilla extract.
05 - Add half the dry ingredients to wet mixture and mix gently. Pour in milk, then add remaining dry ingredients, mixing until just combined.
06 - Gently fold raspberries into batter, taking care not to crush them.
07 - Pour batter into prepared pan and smooth top. Bake 38–42 minutes until toothpick inserted in center comes out clean.
08 - Cool in pan 15 minutes, then transfer to wire rack. Once completely cool, dust with powdered sugar and sprinkle chopped pistachios.