What might be the link between Nora’s “contraband” macaroons and her “huge desire to say - to hell and be damned?”

In Ibsen's play, A Doll's House, the protagonist undergoes substantial character development as she transforms from a somewhat childish mother and wife into an independent, single woman. For this reason, the play, with its feminist message, was unprecedented in its time.
As the curtain opens, Nora is in the process of enjoying her "contraband." While the term is played off humorously between husband and wife, it is strongly indicative of Torvald's attitude toward Nora. Although she is his wife, he treats her as another of the children, doting upon her without taking her seriously. Just as an indulgent parent would playfully lecture his daughter for sneaking cookies from the jar, Torvald teases his wife for her purchase.
Likewise, Nora's desire to swear reflects childishness: a childishness which is likely a response to Torvald's patronizing behavior. Again, as a child would be restricted from using this phrase, Nora feels inhibited. She is not free to express herself, as she is only Torvald's "doll."
Of course, Nora leaves at the end of the play. No longer content to live in "a doll's house," she walks away from Torvald and the children.