1. Preheat oven to 350°.
2. To prepare crust, combine crumbs, sugar, salt, and chocolate in a bowl, stirring well to combine. Add butter and oil; toss with a fork until moist. Press crumb mixture into bottom and up sides of a 9-inch pie plate coated with cooking spray. Bake at 350° for 8 to 10 minutes or until beginning to brown; cool completely on a wire rack.
3. To prepare filling, place yogurt and next 4 ingredients (through milk) in a bowl; beat with a mixer at medium speed for 2 minutes. Pour mixture into prepared crust. Bake at 350° for 14 minutes or until set. Cool pie completely on a wire rack. Cover loosely, and chill at least 2 hours. Serve with whipped topping.