I agree with the poster above, their breakfast choices symbolize their age. Remember, the boys are 14, 17, and 20 years old. When they eat cake for breakfast, it reminds the reader of their age and innocence. They are in a horrible situation, having lost both parents tragically, and Darry is doing the best he can to take care of his brothers. Allowing them to eat cake for breakfast shows that he is still a child himself.
I've always thought of Darry allowing Ponyboy and Sodapop to eat chocolate cake for breakfast was S.E. Hinton's way of showing the reader that although Darry has taken over the responsibility of being the parent in their family, he is still not very different from his brothers.
well i agree they did have alot of chocolate cake in the morning cause it was good
i agree with the people above. it shows how darry allows his younger brothers compensate for losing thier parents and this shows that darry is being mature by helping his brothers get along