Shrimp stuffed mushroom

Ingredients:

parmigiano reggiano
1 small Onion, finely chopped
20-25 large Mushrooms, stems removed
20-25 large shrimps, peeled, finely chopped(does not matter cooked or uncooked)
8 large Mushroom stems, finely chopped

How to make?
Directions:

1.Saute onion and mushroom stems in olive oil until tender.
2.Mix chopped shrimps, onion and mushroom stems.
3.Put little bit of flour on the top of the each mushroom,
4.Stuff each mushroom,put thinly sliced cheese on each mushroom
5.bake at 180c deg. for 10-15 minutes.