Mississippi Mud Pie

Ingredients
| 1 Cup Powdered Sugar | 1 cup Semisweet Chocolate Morsels |
| 1/4 cup margarine, cut up | 1/4 Cup Whipping Cream |
| 2 TBS light corn syrup | 1 tsp. vanilla extract |
| 3/4 cup chopped pecans | 2 pints coffee ice cream, divided |
| Prepared chocolate crumb crust |
Preparation