In a small bowl, beat the milk, eggs and butter. Combine flour and salt; add to egg mixture and beat until smooth. Cover and refrigerate for 1 hour. Heat a lightly greased 8-inch nonstick skillet. Stir batter; pour 1/4 cup into the center of skillet. Lift and tilt pan to evenly coat bottom. Cook until top appears dry; turn and cook 15-20 seconds longer. Remove to a wire rack. Repeat with remaining batter, greasing skillet as needed. When cool, stack crepes with waxed paper or paper towels in between. In a large saucepan, melt butter. Stir in flour until smooth. Gradually stir in broth and Worcestershire sauce. Bring to a boil; cook and stir for 2 minutes or until thickened. Reduce heat; stir in 2 cups of cheese. Cook and stir for 10 minutes or until cheese is melted. Remove from the heat; stir in sour cream until smooth. Place four broccoli spears and 1/3 cup of chicken down the center of each crepe; top with 1/3 cup cheese sauce. Roll up and place seam side down in a greased 13-inch x 9-inch baking dish. Pour remaining cheese sauce over crepes; sprinkle with remaining cheese. Bake, uncovered, at 350° for 20 minutes or until heated through. Yield: 8 crepes.