Slow Cooker Vegetarian White Chili

Drain and rinse the black beans. Cut kernels off the corn cobs (or drain canned corn). Dice the white onion and mince the garlic. Add all ingredients except the kale to a slow cooker. Cook on low for 7-8 hours or on high for 3-4 hours. Serve the chili over fresh kale and top with Greek yogurt, cilantro, avocado, and cornbread crisps if desired.