Preheat oven to 375°F (190°C). Line oven trays with baking paper. Sift together all the dry ingredients, and then add the chopped ginger. When the margarine has cooled slightly, beat in the treacle, egg and milk and pour into the flour mixture. Mix quickly and lightly until mixture forms a firm dough.
Place teaspoonfuls on prepared trays and press down gently with a fork dipped in flour. Bake for 12-15 minutes or until golden brown. Allow to cool on wire rack.
To make Cream Cheese Spread:
Beat together the ingredients until light and creamy. When the biscuits are cold, simply spread between two biscuits to make a sandwich. Store in sealed containers in a cool location.