Combine ingredient,except cranberries, in a mixer bowl and beat until smooth. Spread on bars when completely cooled.
Sprinkle the cranberries over top of frosting.
Whisk together ingredients and drizzle over cranberries in a back and forth motion using a squirt bottle or plastic storage bag, corner cut off.
Cover bars and chill for 2 hours. Then cut bars length-wise down the center -then cut then across 4 times making 8 bars and cut those bars in half diagonally making 16 triangular bars.