Preheat oven to 450 degrees. Grease 8-inch square baking dish. Melt butter with chocolate in bowl in microwave on high for 2-3 minutes. Stir after each minutes. Mix together sugar, flour, baking powder in large bowl. Add eggs, vanilla and almond extract. Mix well. Add chocolate and stir until well blended. Stir in nuts. Pour into pan. Bake about 15-20 minutes. Dont overcook! Cool before cutting.