Rocky Road Dessert Pie (it's more like cake)

1 pkg. chocolate fudge cake mix
2/3 cup water
3 tablespoons vegetable oil
2 eggs
1 and 3/4 cups whipping cream (heavy cream)
2/3 cup miniature marshmallows
2/3 cup chopped walnuts
1/2 cup semisweet chocolate chips
Chocolate glaze

Oven 350 degrees. Grease a 9 inch pie plate with shortening. Dust with sugar. Reserve 1 and 2/3 cups lightly packed cake mix (dry). Beat remaining cake mix, the water, oil and eggs in a bowl on low speed for 30 second, medium speed for 2 minutes. Spread in the pie plate. Bake for 30-35 minutes or until the cake springs back when touched in the center. Cool completely. Beat heavy cream and reserved cake mix until stiff. Fold in marshmallows, nuts and chips. Spread over cake. Prepare glaze; immediately drizzle over top. Refrigerate at least 2 hours before serving. Refrigerate leftovers.
Chocolate glaze: Heat and stir 1 Tablespoon heavy cream, 1 teaspoon margarine, and 1 0z. chopped semisweet chocolate over medium heat until smooth.