Low-fat Fudgy Brownies

Ingredients

 * 4 oz unsweetened chocolate
 * ½ cup prune purée
 * 3 large egg white
 * 1 cup sugar
 * 1 tsp salt
 * 1 tsp vanilla
 * ½ cup flour
 * ¼ cup walnuts

Directions

 * 1) Preheat oven to 350°F.
 * 2) Coat an 8-inch square baking pan with vegetable cooking spray; set aside.
 * 3) Cut chocolate into 1-inch pieces and place in heat-proof bowl.
 * 4) Set over low heat in small skillet containing ½-inch simmering water.
 * 5) Stir occasionally just until chocolate is melted. Remove from heat; set aside.
 * 6) In mixer bowl combine all ingredients except flour and walnuts; beat to blend thoroughly.
 * 7) Mix in flour. Spread batter in prepared pan; sprinkle with walnuts.
 * 8) Bake about 30 minutes until springy to the touch about 2 inches around edges.
 * 9) Cool on rack. Cut into 1½-inch squares.