Heat olive oil in a skillet over medium-high heat; cook onion until soft and translucent, about 5 minutes.
Combine cooked onion, diced tomatoes, vegetable stock, corn, chickpeas, tomato paste, and sweet potato in a slow cooker; season with sriracha sauce, chili powder, cinnamon, nutmeg, and cumin.
Cover and cook on Low until flavors combine, 8 to 9 hours.
