Mushroom Croustades - cooking recipe

Ingredients

3 Tbsp. butter
1/2 lb. mushrooms, finely chopped*
1/2 tsp. salt
1/4 c. sour cream
1 pkg. frozen puff pastry, thawed
1 large onion, finely chopped*
1/4 tsp. dried thyme
2 Tbsp. flour
1 Tbsp. dry sherry

Preparation

*I use the Cuisinart.