Sift together the flour, baking powder, baking soda and salt.
Stir well to mix.
Cream the butter or margarine with the sugar and gradually add the eggs and then the vanilla extract.
Gradually add the flour to the butter and egg mixture and mix well.
Add the nuts, fruit and sprinkles and combine.
Chill the dough for 30 minutes to improve handling.
Shape the dough into four rolls approximately 1½" (4 cm) diameter and wrap in parchment paper.
Refrigerate the rolls overnight.
Slice into 1/4" (0.75 cm) slices using a sharp knife.
Bake on a cookie sheet covered with parchment paper in batches for approx 8-12 minutes until golden at 375°F or 190°C