In a small bowl, add Luke-warm water, yeast and sugar, Cover and keep it aside for 10-15 minutes till the yeast activates. In a mixing bowl, add all purpose flour, yeast mixture, vegetable oil, and salt. Mix it well.
Add water and knead the flour well to make a stiff dough.
Cover in a plastic sheet and keep it aside for 2-3 hours or till the dough gets double in size.
Now the dough is ready, Remove sheets and knead well for 1 minute. Divide the dough into 2-3 equal portions.
Take one portion of the dough, dust with flour and roll it into a circle of 8-9 inches in diameter.
Put the rolled dough on a butter paper and make fold it on the sides.
Spread pizza sauce on it.
Spread some grated mozzarella cheese, and put onion, capsicum , mushroom and tomato slices.
Now put mozzarella cubes, some more grated cheese, oregano herbs and chili flakes.
Put a small stand in the cooker and put the pizza on it. Remove whistle and close the cooker.
Cook it on a high flame for 3-4 minutes, then keep the flame low and cook for 8-10 minutes.
Open and cut into a shape. Delicious homemade pressure-cooker pizza is ready to serve.