Heat oil over medium-high heat in a 12-inch skillet. Cook chicken 6 minutes or until browned, turning once.
In a 6 quart slow cooker, combine chicken, mushrooms, broth, water, leeks, celery, carrots, Wild Rice and salt. Cover and cook on low for 6 hours or high for 3 hours.
Remove chicken from cooker and shred. Return chicken to slow cooker and turn heat to high.
Blend tofu, milk, flour and thyme in a blender or food processor until smooth. Stir mixture into cooker. Cover and simmer for 30 minutes or until thick.
Notes
For a vegetarian meal, eliminate chicken and add a can of light red kidney beans.