1. In a large bowl, toss chicken with cumin and salt to coat. In a large skillet, cook chicken, half at a time, in hot oil over medium heat until no longer pink. Drain off fat. Place chicken in a 4- or 5-quart slow cooker. Stir in salsa, stir-fry vegetables, beans, and undrained tomatoes.
2. Cover and cook on low-heat setting for 4 to 5 hours or on high-heat setting for 2 to 2-1/2 hours.
3. Reserve 3 cups of the chili; store as directed below. Serve remaining chili. If desired, top with sour cream and cheese. Makes 4 (1-1/2-cup) servings and reserves.
To store reserves: Place chili in an airtight container. Seal and chill for up to 3 days.