Spinach And Mushroom Crepes - cooking recipe

Ingredients

Crepes (recipe follows)
5 Tbsp. butter or margarine, divided
1/4 lb. mushrooms, thinly sliced
1 1/2 c. spinach leaves, torn into small pieces
2 Tbsp. plus 1 tsp. all-purpose flour, divided
1 c. milk, divided
1/2 c. Ricotta cheese
1 Tbsp. dry sherry
salt
pepper
1 Tbsp. chopped fresh chervil
1 egg yolk
2 Tbsp. sour cream
additional chopped fresh chervil (optional)

Preparation

Prepare crepes (recipe follows)