Decorated Brownies

For a Bridal Shower we had recently I wanted the brownies to be decorated with white chocolate chips and also to be able to be square and have each one look nice.  So we took a long piece of dental floss and marked even lines in the frosting of where we would cut.  Then we were able to put the chocolate chips onto each piece.  When it came time to cut we carefully cut on the lines.  I found it was squarer when I just used a small spatula and pressed down across each line instead of running a knife down the line.