Line a rimmed baking sheet with waxed paper and set aside.
Place the butter, sugars milk and salt in a medium sauce pan. Cook over medium low heat until the butter melts, stirring occasionally. Increase the heat to medium and bring to a boil, stirring occasionally. Boil for 1 minute stirring constantly.
Remove from heat and stir in the Biscoff and vanilla, then stir in the oats. Let the mixture cool for about about 10-15 minutes until it begins to set.
Using a 1 1/2" cookie scoop, scoop out the cookie mixture onto the prepared pan...there will be about 25. Place in the refrigerator to chill until completely set.
When the cookies are set, place a sauté pan with about 2 inches of water over medium heat. When it comes to a simmer, remove from heat. Roughly chop the white chocolate and place in a heat proof bowl, and set it in the water in the sauté pan. Stir the chocolate until it melts and is smooth.
Dip each cookie in the chocolate and place back on the waxed paper on the rimmed baking sheet. Drizzle the remaining chocolate over the top of the cookies and immediately sprinkle with the dried cranberries. Let stand at room temperature until set, then serve and enjoy!
Notes
I piped the melted white chocolate on the cookies by placing it in a zip top plastic bag and snipping off one corner.
I don't recommend using white chocolate chips here as they don't melt as well as the baking the bar.