Sweet Potato Spiced Chili

Name: Sweet Potato Spiced Chili
Cook time: 30 min
Total time: 30 min
Cuisine: American, TexMex
Ingredients: 1 tsp (5 mL) olive oil; 1 medium yellow onion, roughly chopped; 1 head garlic, roasted, chopped (or 3 cloves fresh garlic, finely minced); 1 red chilli pepper, finely chopped, optional; 3 medium tomatoes, chopped; 1 Tbsp (7 g) onion powder; 1 Tbsp (7 g) garlic powder; 1/2 Tbsp (4 g) ground cumin; 1/2 Tbsp (2 g) oregano; 1 tsp (2 g) paprika; Sea salt to taste; 1 medium sweet potato, cut into 1 cm cubes; 1 litre (4 cups) water; 1.5 cup (250 g) cooked black beans (1/2 cup dry beans, or 1 can); 1.5 cups (250 g) cooked red kidney beans; 3/4 cup (130 g) corn kernels, fresh or frozen; 1 ripe avocado, chopped; 1 ripe tomato, chopped