Southwest Black Bean Sweet Potato Soup

Name: Southwest Black Bean Sweet Potato Soup
Prep time: 30 min
Cook time: 40 min
Total time: 1 h 10 min
Cuisine: American
Ingredients: 2 Tablespoons Olive Oil; 1 Cup Yellow Onion (diced); 3 cloves Garlic (minced); 1 teaspoon Cumin; 1 teaspoon Chili Powder; 1/2 teaspoon Chipotle Chili Powder; 1 teaspoon Salt; 1/2 teaspoon Black Pepper; 1/4 teaspoon Red Pepper Flakes; 3 Cups Sweet Potatoes (about 2 medium potatoes, peeled and cut into cubes); 3 Cups Vegetable Broth; 30 ounces Black Beans (2 cans, drained and rinsed); 1/4 Cup Vegan Sour Cream; 1 Tablespoon Lime Juice; 1 Cup Frozen Corn (optional)