Franky. Below is one creamy mushroom soup recipes already posted on TKL. There are many more if you search TKL using: mushroom soup.
Also, you will find many tried-and-true potato soup recipes searching TKL for: potato soup.

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Title: Recipe: Creamy Mushroom Soup
Posted By: di
Date: November 4th 1998
In Reply to: Soups
Board: TKL Cooking Club Creamy Mushroom Soup

Ingredients (2 servings)

1/4 c Chopped Onion
2 tb Snipped Parsley
1 tb Butter Or Margarine
1 1/2 c Fresh Sliced Mushrooms
1 1/2 ts Cornstarch
1 ts Instant Beef Bouillon
1/2 ts Worcestershire Sauce
1/8 ts Dry Mustard
1 x Dash Freshly Ground Pepper
2/3 c Water
1/2 c Dairy Sour Cream
1 x Snipped Parsley (Opt.)

Instructions

In a 4-cup measure micro-cook the chopped onion, the
2 T snipped parsley, and butter or margarine,
uncovered, on 100% power for 1 to 1 1/2 minutes or till
the onion is tender but not brown. Stir in the sliced
fresh mushrooms. Micro-cook, covered, on 100%
power for 2 to 3 minutes or till the mushrooms are
tender, stirring once. Stir in cornstarch, beef bouillon
granules, worcestershire sauce, dry mustard, and
freshly ground pepper. Add water; mix well.
Micro-cook, uncovered, on 100% power 3 to 4 minutes
or till thickened and bubbly, stirring twice. Combine hot
mushroom mixture and dairy sour cream in a blender
container. Cover and blend till mixture is nearly
smooth. Pour back into the 4-cup measure.
Micro-cook, uncovered, on 100% power about 1 minute
or till the mushroom mixture is heated through. DO
NOT BOIL! Garnish with additional snipped parsley, if
desired.