Chocolate Mousse Brownies
["1/2 c. butter", "1 (12 oz.) pkg. semi-sweet chocolate chips", "2 c. sugar", "1 1/4 c. flour", "2 tsp. vanilla", "1/2 tsp. baking powder", "1/2 tsp. salt", "3 large eggs", "1/2 c. chopped pecans"]
["In large microwave-safe bowl, melt butter and chocolate chips on High for 90 seconds, stirring every 30 seconds.", "Stir in remaining ingredients (except pecans).", "Beat until smooth.", "Stir in pecans.", "Spread into buttered 13 x 9-inch baking pan.", "Set aside."]
["butter", "semi-sweet chocolate chips", "sugar", "flour", "vanilla", "baking powder", "salt", "eggs", "pecans"]