Place chicken, tomatoes, kidney beans, chiles, chili powder, sugar, cumin and corn niblets in crock pot; stir to blend. Cook on medium heat for 4 hours.
After about 3 hours cooking time, preheat oven to 450 degrees F. Place carrots, fennel and onions on a cookie sheet. Drizzle with the olive oil; toss to coat. Spread vegetables in single layer on cookie sheet. Roast 20 minutes, stirring occasionally. Stir vegetables into chili.
Reduce heat in oven to 350 degrees. Microwave flour tortillas at high (100%) power for 15 seconds to soften. Spray 8 large custard cups with non-stick cooking spray. Gently press each tortilla into the cups. Spray tortillas with non-stick cooking spray. Bake at 350 degrees F. for 10 minutes. Remove tortilla bowls from custard cups and place back on cooking sheet. Return to oven for 3 minutes or until crisp. Remove from oven and set aside.
To serve, place the tortilla bowls on serving plates. Spoon chili into tortilla bowls. Top each with a 2 tablespoon dollop of sour cream, then with 1/2 tablespoon cheddar cheese and spring onion slices.
Makes 8 servings