Add everything to a large bowl and mix until just blended. The batter can be lumpy, that's normal.
Spray an oval slow cooker with non stick spray.
Pour in the batter.
Place the lid on the slow cooker and cook on HIGH For 2 hours and 15 minutes OR until the center is no longer jiggly. Watch towards the end of the cooking time. And KEEP the lid on, you don't want to disturb the cake while its rising.
When the cooking time is up, remove the stoneware from the insert and place on a cooling rack.
Cool before slicing and enjoy!
Notes
Place any remaining zucchini bread in an airtight container and keep it on the counter for up to 3 days. Extend its freshness by keeping it in the fridge for up to 1 week. This bread also freezes well for up to 3 months.
Zucchini bread is great served cold or toasted with a spread of butter (and jam!).