In a large skillet, saute sausage and andouille over medium to high heat until browned.
In a separate Dutch oven pot, sauté vegetables and garlic in vegetable oil showered with Cajun seasoning, over medium to high heat for 20-30 minutes, until soft.
Add the roux. Stir for about a minute, or until well blended with the cooked vegetables.
Add chicken stock. Stir for a couple of minutes, or until well blended.
Add mushrooms and cooked chicken to the pot. Then add the browned sausage and andouille.
Add seasonings.
Add 24 oz of water. Stir.
Cover and simmer for 2 hours. Stir every 30 minutes or so.
Cook rice according to package instructions.
When the gumbo is done simmering add 8 oz. of cold water and stir.
Serve over rice and enjoy!