Melt butter in saucepan; blend in flour. Add chicken broth (canned or homemade) and milk and cook, stirring constantly, until mixture is thick and bubbly. Add Cheddar cheese, 1/4 cup Parmesan cheese, salt, and pepper; stir until cheeses melt. Place asparagus in 10" pie pan, sprayed with vegetable spray. Pour sauce over the asparagus. Sprinkle with 2 tablespoons Parmesan cheese. Broil until bubbly. Makes 6 servings.