In a medium bowl, using clean hands, blend together the streusel topping mixture. Set aside.
Raspberry Muffins
In a large mixing bowl, cream together granulated sugar, brown sugar and butter. Add the vanilla extract, eggs, sour cream, salt and combine. Add the flour and baking powder. Scrape down the sides of the bowl occasionally with a rubber spatula. Fold in the raspberries.
Scoop the batter evenly into 12-paper lined muffin tins. Top with streusel topping.
Bake in a preheated 350 degree F oven for about 30 minutes. Or until a toothpick, when inserted comes out clean.