Preheat the oven to 180°C/350°F and line a baking tray with baking paper or a silicone baking mat. Place the chicken breasts on the tray, drizzle with 1 Tablespoon of olive oil and sprinkle with 1 Tablespoon of the Burrito Spice Mix. Bake for 25-30 minutes until cooked through. Remove from the oven and use 2 forks to shred the chicken. Set aside.
While the chicken is cooking, place the remaining olive oil into a large saucepan and fry the onion, red or green pepper, garlic and remaining Burrito Spice Mix for 5 minutes over a medium heat. Add all remaining ingredients to the pot and bring to a boil. Turn the heat down to medium-low and simmer for 20 minutes until the soup has thickened up. Add the shredded chicken.