In a small saucepan, melt butter and chocolate over low heat, stirring until smooth. Remove from the heat; cool. Beat in egg and vanilla. Combine sugar and flour; stir into chocolate mixture.
Spread into an 8x4-in. loaf pan coated with cooking spray. Bake at 350° for 15-18 minutes or until a toothpick inserted in the center comes out clean. Cool on a wire rack.
For topping, in a small saucepan, combine the chocolate chips, unsweetened chocolate and 2 tablespoons cream. Cook and stir over low heat until melted and smooth. Remove from the heat. Stir in butter and vanilla. Cool.
In a small bowl, beat remaining cream until it begins to thicken. Add confectioners' sugar; beat until stiff peaks form. Fold in chocolate mixture. Mash 1/2 cup raspberries; fold into mousse. Spread over brownies; sprinkle with remaining berries. Refrigerate for 2 hours or until firm.