Prepare the crepes according to the basic recipe and set aside

Saute the sausage until it is lightly browned, about ten minutes

Remove it to a mixing bowl with a slotted spoon

Saute the onions and mushrooms in the sausage drippings until the onion is translucent, about ten minutes

Remove with a slotted spoon to the bowl with the sausage

Add the mozzarella and two beaten eggs to the sausage mixture and mix through well

Brush each crepe with the remaining beaten egg

Divide the sausage mixture among the crepes

Place the filling on half of the crepes only and leave a one-inch border

Fold the bare half of each crepe over the filling and press the edges down firmly

Spread half of the tomato sauce in the bottom of a baking pan

Carefully place the crepes in a single layer on top of the sauce

Pour the rest of the sauce over the crepes and sprinkle the Parmesan cheese and parsley evenly over all

Bake in a pre heated 400F

oven, covered, for about thirty minutes or until the sauce is bubbly and the crepes are heated through.