Heat oven to 350°F. Combine all crust ingredients in small bowl. Beat at low speed until mixture resembles coarse crumbs. Press onto bottom of ungreased 13×9-inch baking pan. Bake for 15 minutes.
Meanwhile, combine all filling ingredients in large bowl. Beat at medium speed until smooth; pour over crust. Continue baking 20 minutes.
Stir together 1/2 cup brown sugar and pecans in small bowl; sprinkle over filling. Continue baking for 15 to 25 minutes or until knife inserted in center comes out clean. Cool completely. Store refrigerated. Garnish with sweetened whipped cream, if desired.