Preheat the oven to 180°C.
Coarsely chop the pistachios and set aside.
In a stand mixer fitted with the paddle attachment (or with hand held beaters), whisk together the sugar and the eggs on medium speed, until thick, about 2-3 minutes. Lower the speed and with the machine running, add the butter, vanilla extract, cake flour, salt and baking powder. Increase the speed to medium and whisk until just incorporated. By hand, fold in the raspberries, being careful not to break them up too much and half of the reserved pistachios. Divide evenly between the muffin tins (or other small molds). Sprinkle the remaining half a cup of pistachios evenly over the cakes. Bake for 20 minutes or until golden brown. Let cool on wire racks.