Preheat the oven to 200 C

Dissolve yeast in the milk -water mixture

Add sugar, salt, oil and mix.

Add the flour and knead the dough for 8 -10 minutes till it is smooth and elastic.

Cover and keep aside for an hour or till the dough doubles in size.

For the filling, in a pan add oil.

Add the onions and garlic and mushrooms.

Add salt and pepper to taste.

Saute for 5 minutes on high heat till all the juices dry up.

Remove from heat and add the grated cheese and the dried oregano.

Keep aside to cool.

Divide the dough into 7 -8 equal balls.

Roll each dough into circles.

Put 2 tbsp of filling on one half of the rolled dough and fold the dough over the filling to form a half - moon.

Pinch the edges with your fingers to seal them.

Place the calzones in a baking tray and brush with egg wash.

Bake for 20 -25 minutes till crust is golden brown.