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Mum's Black Walnut Cookies
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1/2 cup margarine
1/2 cup brown sugar
3/4 cup granulated sugar 
1 egg 
1 tsp vanilla 
1/2 cup black walnuts 
2 cups flour 
1/2 tsp salt 
2 tsp baking powder 

Cream margarine, brown sugar, and granulated sugar well. Add egg and vanilla and beat. Mix in walnuts. Add flour, salt, and baking powder and mix well. Shape into rolls, wrap in wax paper, and chill until firm. Slice thin and bake on greased sheet 10 mins at 450. Makes four dozen. 

Source: Grandmother North via Barbara North