Roll out the dough to be thin but not too thin to cover the pelmeni maker, it will hold the filling in the pelmeni maker.
Add a teaspoon or so of the filling in each hole.
Roll out another piece of dough and place over the top of the stuffed pelmeni and using a rolling pin roll the top so that they fall through the bottom.
If you do not have a pelmeni maker just roll out the dough and cut out 2 1/2" circles using the rim of a small glass. Scoop a bit of the mushroom mixture into the circle and fold in half, be sure to press the edges together tightly and make them in the shape of a half moon.
Put a large pot of water on the stove to boil with 1 teaspoon salt and the bay leaves.
When the water is boiling add the pelmeni gently into the water and stir lightly until they pop up to the top. Cook for about 5 more minutes and remove with a slotted spoon.
Serve hot with your choice of topping olive oil, or butter, or sour cream.
Alternatively you can serve them in a hot vegetable broth and garnish with parsley.