In a skillet, brown ground beef, drain. Stir in taco seasoning, tomato sauce, green pepper and spices. Bring to a boil, remove from heat. Meanwhile, combine pasta, 1/2 cup cheese and sour cream. Spoon into the bottom of greased 2-quart baking dish. Top with mest mixture and remaining cheese. Bake uncovered, at 350 degrees for 30 minutes. Makes 6 servings.