Preheat oven to 350°. Combine pecans with brown sugar in small bowl; set aside.
Beat sweet potatoes, Country Crock® Pumpkin Spice Spread, egg substitute and flour in large bowl with electric mixer until fluffy, about 2 minutes. Add marshmallow creme and beat just until blended. Spoon into ungreased 1-1/2-quart casserole; sprinkle with pecan mixture. Bake 30 minutes or until bubbling.