In a large bowl, beat butter and sugar together until completely creamy. Beat in egg and vanilla until smooth. Combine flour, baking powder, and salt. Beat flour mixture into liquid until a soft dough forms. Wrap dough in plastic wrap and refrigerate 1 hour.

Remove chilled dough from refrigerator and roll into 2-in balls. Place on parchment paper-lined baking sheets and flatten slightly. Bake cookies at 350F 9-10 minutes or until edges just begin to brown. Allow to cool on baking sheet 5 minutes, then transfer to a wire cooling rack.

In a double boiler over high heat, melt white chocolate until smooth. Divide melted white chocolate in half and frost cookies with one half and arrange dried cranberries on top. Drizzle remaining white chocolate on top of cranberries. Let cookies set 10 minutes then store or serve. Enjoy!