The Answer is a book with a DVD in it.
After Bart gets Mrs. Krabappel fired he feels guilty after seeing her just sitting in front of the TV all day. To help her get back on track he gets the book which is supposed to help you achieve your dreams. At first Ms. Krabappel is skeptical but ends up using it and sometime in the future she has opened a muffin shop, named Edna's Edibles, which was her dream after being a teacher.
Behind the laughter
The book is a parody of the real-life self-help book "The Secret" by Rhonda Byrne.