3 tbsp. butter
1 tsp. flour
1/2 lb. fresh sliced mushrooms
1 tsp. soy sauce
3/4 c. sour cream
Salt & pepper

Melt butter; add mushrooms and sprinkle with flour. Cook over medium heat until tender, 8 to 10 minutes, stirring occasionally. Add soy sauce slowly. Add cream (possibly thinning with a little milk). Cook and stir until mixture bubbles and thickens. Season to taste.