5 books in series

The Adventures of Arnie the Doughnut

The Adventures of Arnie the Doughnut is a 5-book series with 5 primary works first released in 2003 with contributions by Laurie Keller.

Bowling Alley Bandit
Invasion of the Ufonuts
The Spinny Icky Showdown
Arnie the Doughnut
Hello, Arnie!: An Arnie the Doughnut Story