In the bowl of your stand mixer, cream the butter until smooth. Add the powdered sugar, vanilla extract and cream (or half and half or milk). Beat on medium high for 2-3 minutes, until very light and smooth. Turn mixer to low and slowly add the raspberry powder. Once combined, turn up mixer to medium high and beat for another 1-2 minutes. Use immediately or refridgerate for up to 3 days. If you refrigerate, let the frosting come to room temperature and beat it again in the stand mixer before using.