Question

add or remove commas, if necessary, until the sentence has correct punctuation.
unless i serve cinnamon rolls at my party
princess fiona will not attend.

Explanation:

The sentence has a dependent clause ("Unless I serve cinnamon rolls at my party") and an independent clause ("Princess Fiona will not attend"). A comma is needed to separate the dependent clause from the independent clause when the dependent clause comes first. So we add a comma after "party".

Answer:

Unless I serve cinnamon rolls at my party, Princess Fiona will not attend.