tiddlywinks’s toadstool pie

Ingredients

• - 1 baked piecrust
• - cream sauce:
• - 3 tbsp. butter, salted or unsalted
• - 3 tbsp. flour
• - 1 cup light cream
• - salt and pepper
• - mushroom filling:
• - 1 pound fresh mushrooms, sliced
• - 2 tbsp. butter
• - 2 small garlic cloves, crushed
• - 3 shallots, minced
• - 2 egg yolks, mixed with 1 tbsp. light cream
• - salt and pepper
• - 2 tbsp. white wine
• - topping:
• - 1/2 cup grated swiss cheese