Breakfast Princess rules with her sister Toast Princess and her little sister Strudel Princess. They, like most princesses, are often bothered by Ice King and need Finn and Jake to get rid of him. This is implied in the beginning of "Hitman," when Breakfast Princess says "I've got another Ice King situation here."
She reappears in "Breezy," where she is seen dancing with the other princesses and later applauding with Finn's act at Crab Princess's party.
She makes her first major appearance in "Princess Day," centering her issues with Lumpy Space Princess. While apprising her about the self-sufficiency that most of the princesses hadn't achieved, she deliberately affront LSP about her not having a kingdom and being a bum. In order to chastise her, LSP and Marceline teamed up to prank her and stole her music tape and car, eliciting her attempt to stop them, but was unintentionally ran over. The two left her on a desert and commanded her to build a sand castle with the shovel, which she accedes until they left. [Source: wikia]
You can download the papercraft template here: Adventure Time - Breakfast Princess Free Papercraft Download