Melt 1/4 cup butter. Add 1 cup brown sugar and dissolve. Beat in 1 egg and 1 tsp vanilla. Sift together 1/2 cup flour, 1 tsp baking powder and 1/2 tsp salt. Stir into butter mixture. Add 1/2 cup finely chopped nuts. Pour into 8x8 floured pan. Bake in 350 degree oven for 30 minutes.
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