
Preheat oven to 325 F. Spray a 9 inch spring form pan, cake or pie pan with non-stick spray.
In a large mixing bowl, fitted with a paddle attachment, cream together butter and sugar until combined. Add in the eggs and vanilla and beat until light and airy.
Mix in salt, baking powder and half the flour until combined.
Fold in the sour cream, followed by the rest of the flour.
Carefully fold in the raspberries and peaches.
Smooth batter into greased pan. Sprinkle the top of the cake with 3 tablespoons of sugar.
Bake for about 40-45 minutes until lightly golden brown. Let cool for a bit before serving.