Stuffed Russian Crepes w/Mashrooms

Ingredients:
For Crepes:
1 egg
flour
water
salt
sugar
oil
cooking spray
(sorry, I never measure when I make them, but if there is a request, I will measure next time I make them and post it here).

For Filling:
2 large potatoes
1 8oz. package of mashrooms
1/2 onion
salt
olive oil
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Directions:
Peel, boil, and mash potatoes. Save the water from boiling potatoes to add to them when you mash them, so that your mash potatoes are not dry.
Slightly fry onions, add mashrooms, close the lid (I do it in the skillet). Once all cooked, add to mash potatoes.

Then put a tablespoon of the filling into the crepe and fold on four sides. Sometimes Russians would put them back on the skillet and get them fried a little more, but I don't like over cooking my food, so I serve them as they are with sour cream.