Preheat the oven to 350° Fahrenheit. Use baking spray or shortening to grease a 9x13" baking sheet.
Sprinkle cranberries with on tablespoon of flour. Shake off any excess flour. Set aside.
Making The Dough
Combine brown sugar, butter, eggs, and vanilla extract and beat with a hand mixer on medium speed until creamy. Add flour in and continue to beat on low speed until well combined. Fold cranberries and white chocolate into the batter.
Pour batter into a 9x13" prepared pan. Bake for 25-30 minutes. Use a wooden toothpick to check for doneness. Allow to cool completely.
Making The White Chocolate Drizzle
Microwave ½ cup of white chocolate chips for 30-60 seconds. Pause after 30 seconds, stir the chocolate. If not melted, return to the microwave and continue to melt using 15 second increments.
Use a spoon to drizzle the melted white chocolate over the blondies. Set aside to cool.