Place yogurt in colander lined with 100% cotton cheesecloth over a mixing bowl. Cover and let drain in refrigerator overnight
For crust in a bowl, combine crushed cookie and melted butter. Press onto bottom of a 9" pan, set aside.
For filling, in a large mixing bowl, beat cream cheese, chocolate, sugar, flour, and valilla with an electric mixer on medium to high speed until combined
Add eggs all at once, beat on low speed just until combined. Do not over beat
Stir in yogurt
Pour filling into crust lined pan. Place on a shallow baking pan
Bake in over at 375° for 35-40 min or until center appears set when shaken
Cover and cool 4 hours or overnight
For topping: bring to boil gently for six min, stirring constantly