Chocolate Raspberry Brownies
["1 c. unsalted butter", "5 oz. unsweetened chocolate, chopped", "2 c. sugar", "4 large eggs", "2 tsp. vanilla extract", "1 1/4 c. flour", "1 tsp. vanilla extract", "1 1/4 c. all-purpose flour", "1 tsp. baking powder", "1/2 tsp. salt", "1 c. chopped toasted walnuts", "3/4 c. raspberry preserves"]
["Butter a 13 x 9 x 2-inch baking pan.", "Melt butter and chocolate in a heavy, large saucepan over low heat, stirring constantly until smooth.", "Remove from heat.", "Whisk in sugar, eggs and vanilla.", "Mix flour, baking powder and salt in small bowl; add to chocolate mixture and whisk to blend.", "Stir in nuts.", "Pour 2 cups batter into pan.", "Freeze until firm, about 10 minutes."]
["unsalted butter", "unsweetened chocolate", "sugar", "eggs", "vanilla extract", "flour", "vanilla extract", "flour", "baking powder", "salt", "walnuts", "raspberry preserves"]