Preparation
Sauce: Cook onion in butter until tender. Stir in flour, water and buoillon; cook and stir until sauce thickens and bouillon dissolves. Remove from heat; stir in sour cream.
Enchiladas: Combine chicken, chees and chilies, pimientos, chili powder, and enough sauce to moisten; mix well. Fill each tortilla with equal amounts of chicken mixture and roll up. Arrange in a lightly greased 13 x 9 baking dish; spoon remaining sauce over enchiladas. Sprinkle with 1/4 cup cheese. Bake until bubbly about 25 minutes.
Serving idea: top with lettuce, tomatoes and taco sauce.