Prepare 2 boxes of brownie mix according to instructions on box. Pour into a greased 9x9-inch (23x23-cm) square pan. Bake according to instructions on box.
Cut each tray of brownies into 25 small squares. Form each brownie square into a ball, rolling in palms until smooth.
In a microwave-safe bowl, add the white chocolate chips and microwave in 30 second intervals until smooth, about 1 minute and 30 seconds total.
In a microwave-safe bowl, add the milk chocolate chips and microwave in 30 second intervals until smooth, about 1 minute and 30 seconds total.
Turn a plastic sandwich bag inside out and hold it from the inside with one hand. Spoon the white chocolate into the bag. Turn the bag back out making sure chocolate does not fall out the opening. Seal it closed. Cut the corner of the bag, keeping in mind the more you cut off the larger your piping hole will be.
Coat the brownie balls in the melted milk chocolate using a fork. Place on a parchment paper-lined baking sheet and chill until chocolate has hardened, about 20 minutes.
Place one of the milk chocolate brownie bites onto a clean surface.
Using the white chocolate piping bag make one dot in the middle of the ball. Draw a circle around the dot. Draw a larger circle around the second circle.
Using a toothpick starting from the inner dot drag the chocolate downward crossing each circle. Repeat 6 times.