Line a quarter sheet pan with cookies

Boil butter and sugar until it reaches 298 degrees

Pour the toffee mixture over the cookies

chop chocolate and place chocolate over hot toffee and spread with offset spatula, until it's melted and smooth

Place mini chocolate chip cookies on top and let the toffee cool and chocolate set up

If you want to speed the process up, place the cookie sheet into fridge for 10 minutes.

Break or cut into pieces.