Preheat oven to 425º Line baking sheet with parchment paper.

In large bowl combine flour, oats, sugar, baking powder, salt, baking soda, and allspice.

Cut in butter with a pastry blender until mixture resembles coarse crumbs.

In small bowl mix together egg and milk. Add egg mixture to flour mixture, mix lightly.

Mix together mashed bananas, sourdough starter, butterscotch chips and nuts. Add to flour mixture, mix lightly.

Turn out dough onto well-floured surface. Knead 8 to 10 times. Pat dough into 10 inch circle.

Stir together oatmeal, brown sugar, and flour. Cut in butter until mixture resembles coarse crumbs. Stir in chopped nuts. Sprinkle mixture over dough. Cut dough into 10 scones.

Carefully place scones onto parchment paper lined baking sheet.

Bake at 425º for 12 to 15 minutes. Remove from baking sheet, cool on wire rack.