Place the Oreo cookies in a food processor and puree until they are finely crushed.

Melt the butter in the microwave and in a large bowl combine the Oreo cookie crumbles and the butter.

Press the crust mixture into a 9-inch tart pan, or if you want to make 4-inch tarts split it between 3 tart pans.

Place tart shells in the freezer for at least 1 hour to let them firm up.

In a mixing bowl combine the butter, brown sugar, white sugar, and vanilla using the paddle attachment to cream the mixture together.

Slowly add the flour 1/4 cup at a time alternating it with 1 Tbsp of milk until you reach a consistency where the dough holds it's shape but is still creamy.

Add 1 cup of the chocolate chips and fold mixture together.

Remove the hardened tart shell(s) from the freezer and scoop the cookie dough into the shell (splitting it between all of the shells if you have more than one). Smooth it out with a knife.

Melt the remaining cup of chocolate chips in the microwave stirring every 30 seconds until it is smooth. Drizzle the chocolate over the tart.

Enjoy!