That's an awesome idea! Getting them to grow their own food is even better - the ultimate origin story!
Homemade snacks are always a good go-to, especially with kids because you can make it a fun and educational process for them. Teaching them about different ingredients and letting them measure and mix things is a great way to make them more open to eating healthier options.
They also get to personalize their own treats, which is exciting! And often times, kids are more willing to eat something they've had a hand in making.