Stir together first 5 ingredients. Pour batter into a lightly greased 9-inch-square pan.
Microwave morsels and 2 tablespoons milk in a 2-cup glass measuring cup at HIGH 1 1/2 minutes or until melted, stirring twice.
Swirl melted chocolate mixture gently through batter with a knife. Sprinkle Coconut-Pecan Topping on top of batter.
Bake at 350° for 20 to 25 minutes or until golden brown.