1Heat oven to 350°F. In medium bowl, mix all crust ingredients until crumbly. Press in ungreased 13x9-inch pan. Bake 10 minutes; cool slightly.
2In large bowl, beat pumpkin, milk, eggs, granulated sugar, salt and pie spice until smooth. Pour over partially baked crust. Bake 20 minutes. In small bowl, mix pecans, 1/2 cup brown sugar and 2 tablespoons butter until crumbly; sprinkle over pumpkin filling.
3Bake 15 to 20 minutes longer or until filling is set. Cool completely.
4In chilled small bowl, beat whipping cream with electric mixer on high speed until soft peaks form. Beat in sugar, orange peel and cinnamon until stiff peaks form. Serve dessert topped with whipped cream. Store in refrigerator.