Coconut-Chocolate Meringue Bars
["3/4 c. butter or margarine", "1/2 c. sugar", "1 1/2 c. firmly packed brown sugar, divided", "3 eggs, separated", "1 tsp. vanilla", "2 c. all-purpose flour", "1 tsp. baking powder", "1/4 tsp. baking soda", "1 (6 oz.) pkg. semisweet chocolate chips", "1 c. flaked coconut", "3/4 c. coasely chopped pecans"]
["Combine butter, sugar, 1/2 c. brown sugar, egg yolks and vanilla in large mixing bowl; beat until thoroughly blended."]
["butter", "sugar", "brown sugar", "eggs", "vanilla", "flour", "baking powder", "baking soda", "semisweet chocolate chips", "flaked coconut", "pecans"]