1Heat oven to 350º F. In large bowl, mix 1/2 cup butter, the brown sugar, granulated sugar, vanilla and egg until well blended. Stir in flour and baking soda (dough will be stiff).
2Pat dough in ungreased 12-inch pizza pan or into 12-inch round on ungreased cookie sheet. Bake about 15 minutes or until golden brown. Cool about 30 minutes.
3In 2-quart saucepan, heat chocolate chips, 2 tablespoons butter and milk over low heat, stirring occasionally, just until chocolate is melted; remove from heat. Stir in powdered sugar. Beat with wire whisk until smooth, glossy and spreadable. (If not glossy, stir in a few drops hot water).
4Spread chocolate mixture over baked layer. Immediately sprinkle with pecans, candies and coconut; press lightly. Drizzle with melted baking bars. Let stand until set. Remove from pan if desired. Cut into wedges.