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