For crepes, combine flour, milk, egg, and salt. Beat until blended. Spray a 6-inch skillet with nonstick spray coating. Preheat skillet; then remove skillet from heat. Pour in 2 tablespoons batter. Lift and tilt skillet to spread batter. Return to heat; brown on one side only. Invert skillet over paper towels; remove crepe. Repeat with remaining batter.

For sauce, combine mushrooms, carrot, leek, and water. Heat to boiling. Reduce heat; cover and simmer 5 minutes. Do not drain. Combine milk, cornstarch, salt, and pepper. Stir into vegetable mixture. Cook and stir until thickened and bubbly. Stir in sherry and 1/2 cup of the cheese until melted.

For filling, combine spinach, chicken, and 1 cup of the sauce. Spoon 1/4 cup filling onto unbrowned side of each crepe. Roll up. Arrange crepes, seam side down, in a 3-quart rectangular baking dish. Spoon remaining sauce over crepes. Cover; bake in a 375 degree F. oven 25 minutes or until hot. Sprinkle with remaining cheese. Bake, uncovered, 5 minutes more. Makes 6 servings (2 crepes each).

Cool crepes. Stack crepes, placing 2 sheets of waxed paper between them. Wrap and freeze up to 2 months. Thaw before using.