Preheat oven to 350 degree F. Lightly grease a 13x9x2-inch baking pan; set aside.
In a medium mixing bowl beat the 1 egg with an electric mixer on medium speed until fluffy and light colored. Stir in ice cream topping. Fold in pecans and coconut; set aside.
In a large mixing bowl beat butter with an electric mixer on medium to high speed for 30 seconds. Beat in brown sugar until fluffy. Beat in cooled chocolate, the 2 eggs, and vanilla. Stir together flour, baking powder, baking soda, and salt; beat or stir into chocolate mixture. Stir in chocolate pieces. Spread in prepared pan; spread nut mixture over batter. Bake about 35 minutes or until golden and set. Cool in pan on a wire rack. Cut into bars. Makes 24 bars.