Heat butter and sugar over medium heat until butter is melted, stirring frequently.
Once butter is melted, stick a candy thermometer in and heat, stirring frequently, until temperature reaches 290-300 (around 10 minutes).
Once it reaches temperature, add vanilla extract and immediately pour into a small baking sheet lined with parchment.
Sprinkle a thick layer of milk chocolate chips over top, and wait 5 minutes.
Spread chocolate out with a spatula (it should be melted now) to cover the entire pan.
Top with sprinkles and a drizzle of cookie icing. Refrigerate 2 hours or let harden at room temperature over night.
Break into pieces and enjoy!