Smoky Sweet Potato and Black Bean Chili

Name: Smoky Sweet Potato and Black Bean Chili
Ingredients: * 2 teaspoon olive oil; * 1 medium onion, chopped; * 1 large bell pepper, chopped; * 1 medium sweet potato, peeled and chopped into piece; * 3 clove fresh garlic, minced; * 1 tablespoon chili powder; * 1 tablespoon smoked paprika; * 1 teaspoon ground cumin; * 1 teaspoon ground coriander; * 1 teaspoon dried oregano; * 1/2 tsp kosher salt, or to taste; * 1-2 teaspoon chipotle hot sauce; * 14 1/2 oz canned diced tomato, with juice; * 1 cup low sodium vegetable broth; * 15 oz canned black bean, rinsed and drained; * 1/2 cup avocado, diced; * 4 tablespoon plain greek yogurt or reduced fat sour cream; * 2 scallion, chopped; * 1/2 lime,