I do something like that....
8 oz white button mushrooms
8 oz portobello mushrooms
1/4 cup finely chopped sweet yellow onion
1/8 pound butter ( half a stick)
3 T flour
1 quart chicken broth...home made is best
pint of milk...if if you don't want to use milk use another 2 cups chicken broth.
And a shot....about 3 tablespoonsful of dry sherry wine
Wipe the mushrooms and finely chop...very fine...the porto bellos and half the white, sautee along with the onions in the butter. When soft and they have given up most of their liquid, add the flour and stir and then whisk in half of the chicken broth....
Add the other half of the white mushrooms, sliced and the rest of the broth and the sherry, simmer for 30 to 40 minutes.

I like to use the 2 cups of milk and 2 oz of cream cheese ( about 1/4 of an 8 oz package), after the soup has simmered for 30 minutes....and heat just enough to melt the cream cheese into it. I then omit the extra 2 cups of broth.
Linda C

MUSHROOM CONSOMME (serves 8)
3 lbs mushrooms or mushroom stems (domestic and/or wild mushrooms), cleaned, trimmed & quartered
1/2 lb fresh mushrooms, cleaned, trimmed & quartered
5 lbs chicken scraps including backs, necks & gizzards but no livers
1 white onion, coarsely chopped
2 carrots, peeled & coarsely chopped
1 rip celery, chopped
12 black peppercorns
1/4 tsp whole allspice berries
2 bay leaves
1/2 bunch fresh parsley, rinsed
1/2 tsp dried thyme
1/2 tsp salt
Aquavit or vodka, for garnish - optional

Combine all ingredients except aquavit in a large stock pot over low heat. Cover with 2 to 3 gallons cold water & slowly bring to a boil. Reduce the heat & simmer at least 6 hours, skimming frequently. The broth can simmer up to 24 hours. It should reduce by 1/2 & turn black.
Strain the broth, discarding the solids. Adjust the seasonings with additional salt or pepper to taste. Serve the consomme in a cup & splash each serving with aquavit or vodka if using.~~NY Cookbook

I do one similar to Lindac's and it's excellent. Serve with some brie toast made from No Knead Bread.