Heat oven to 350°F. Combine butter and brown sugar in bowl. Beat at medium speed until creamy. Add all remaining crust ingredients; continue beating until well mixed.
Press half of crust mixture onto bottom of ungreased 13x9-inch baking pan. Bake 8-10 minutes or until light golden brown.
Combine all filling ingredients in bowl; mix well. Pour filling over hot, partially baked crust. Crumble remaining crust mixture over filling and press down lightly.
Bake 30-35 minutes or until top is golden brown and center is set. Cool completely. Cut into bars. Store refrigerated.