Beat butter until soft; gradually add sugar and blend until creamy. Mix in beaten egg and extracts.
Stir salt and baking powder into flour; stir into butter/sugar mixture.
Melt chocolate in water over a double-boiler; add to dough. Form into a long roll approximately 2-3 inches wide. Wrap dough with plastic wrap and chill overnight.
Slice dough 1/4 inch thick and place on greased cookie sheet. Sprinkle with non-paralleils and press in slightly with back of spoon. Bake in 400 degree oven for 8 10 minutes. Cool cookies on rack.