Line a parchment paper on a rimmed baking tray or glassware.
In a microwave-safe bowl, add the white chocolate chips and the sweet condensed milk.
Microwave it for 30 seconds and carefully remove it and using a hand whisk or spoon mix it vigorously.
Most of the chocolate chips would have melted by now. If required microwave it again for 15 more seconds and mix well. It should not take more than 45 to 60 seconds.
Pour this chocolate mix in the tray/vessel lined with parchment paper.
Drizzle the powder peppermint on to and refrigerate it for one hour.
When it cooled down completely, slice it and relish it.
Notes
I went with 1:2 ratios of white chocolate chips to condensed milk.
Depending upon the chocolate variety and your taste preference adjust the measure.
Also, the microwave time varies depending on the power setting. Always, heat in the 30-second interval until it melts. And make sure to stir the chocolate mix during the intervals.
Add in your favorite flavors instead of peppermint.