Playing on "Life, Liberty, and the Pursuit of Happiness":
* Jefferson's Breakfast: Fueling Your Pursuit of Happiness!
* Start Your Day with Liberty & Deliciousness!
* The Cereal that Embodies Life, Liberty, and a Great Start!
Using his Role in History:
* The Founding Father of a Delicious Breakfast!
* Get Your Daily Dose of History and Goodness!
* A Taste of the American Dream, One Bowl at a Time!
Highlighting the Cereal Itself:
* Jefferson's Choice: The Cereal that's Always in Good Taste!
* This Cereal is So Good, It's Un-American to Not Eat It!
* A Declaration of Deliciousness!
Humorous Options:
* Thomas Jefferson Approved: This Cereal is the Real Deal!
* Don't Be a Loyalist, Eat Jefferson's Cereal!
* So Good, It'll Make You Want to Declare Independence!
Remember to consider the target audience and the cereal's brand image when choosing a slogan.