Heat oven to 350 degrees. Grease bottom only of 13x9-inch pan. In large bowl, combine brownie mix, water, oil and eggs; beat 50 strokes with spoon. Add 1/2 cup pecans, chocolate chips and 1 cup white vanilla chips; mix well. Spread in greased pan.
Bake at 350 degrees for 28 to 34 minutes or until center is set. Remove from oven; immediately sprinkle with 1 cup white vanilla chips. Return to oven for 1 minute to soften chips; spread evenly over brownies with back of spoon. Cool.
In small bowl, combine all frosting ingredients except pecan halves. Beat until smooth. (Mixture will be thin.) Spoon over melted white vanilla chips; spread to cover. Arrange pecan halves over frosting.
Cool 1-1/2 hours or until completely cooled. Cut into bars.
Recipe submitted by Miji on 2/17/00