My husband has made terrific non-dairy cream of mushroom soups in the past beginning with a roux, but he's a "dump cook" so there's no way to replicate. However, I found the following on cooks.com...

Substitution: Instead of canned cream of mushroom soup (contains cream) make your own "cream of mushroom soup" (it works!) as follows:
8 oz. mushrooms, diced
8 oz. (1 c.) chicken broth
2 tbsp. butter
2 tbsp. flour
2 tbsp. cornstarch
1 (6 oz.) (3/4 c.) non-dairy creamer
1 tsp. garlic powder
Dash salt & pepper
Combine all the Substitution ingredients in a covered saucepan and simmer for 20 minutes. Use in place of canned cream of mushroom soup if desired.

Good luck, and bon appetit!
Source(s):
http://www.cooks.com/rec/view/0,1739,158187-234192,00.html

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