HEAT oven to 350 degrees F. Combine flour and brown sugar in medium bowl; cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs. Press mixture into bottom of 13 x 9-inch baking pan.
BAKE 10 to 15 minutes.
COMBINE pecans, sweetened condensed milk, eggs and lemon juice in small bowl; pour over partially baked crust.
BAKE 25 minutes or until filling is set. Cool. Cut into bars.