Crust: Combine chocolate cookie crumbs and butter and press into a pie plate; set aside.
Filling: Beat cream cheese in a mixing bowl till fluffy; gradually beat in sweetened condensed milk. Add egg and vanilla and mix well.
Toss chips with flour and stir into the batter. Pour into crust.
Bake at 350 for about 35 minutes or until center springs back when touched. Cool. Chill in refrigerator till cold.
For glaze, melt chips and oil in a small glass bowl in the microwave. Add enough oil till chocolate is thin enough to drizzle easily. Drizzle over entire pie, or over individual servings.
Notes
-Light cream cheese doesn't work as well for this cheesecake. The filling doesn't set up as well, so the chips sink to the bottom.
Tossing the mini chips with flour helps prevent them from sinking to the bottom.
I tried using regular size chocolate chips once, and they all sunk, even though I used flour.