The 39-year-old star has two young daughters - Violet, five, and Seraphina, two - with her actor husband Ben Affleck.
She recently kicked off Frigidaire Kids' Cooking Academy Summer Session with chef Adam Kaye.
The new summer session gives kids and parents an insight into the seasons of food and how recently-picked ingredients can be made into a meal.
Garner said: 'I'm a huge fan and avid supporter of my local Farmers Market. Showing kids how foods go from farm to table is an important first step in creating healthy eating habits.
'The Frigidaire Summer School is a great way to educate kids and their parents about the importance of eating fresh.'