Combine wheat flour, refined flour, baking powder and salt in a bowl. Add milk and knead into a soft dough. Cover with a damp cloth and set aside for 15 minutes.
Divide dough into large equal portions and shape into pedas.Combine grated potatoes, salt, red chilli powder, garam masala powder, chaat masala, coriander leaves and green chillies in another bowl.
Dust each pedas with refined flour and flatten into a large disc. Place a spoonful of potato mixture, bring in the edges together and seal. Roll each stuffed ball into a kulcha.
Heat a Wonderchef Pizza Pan, place a kulcha on it. Slice olives.Cook the kulcha till underside is golden. Flip and spread 2 tbsps tomato concasse on it.
Put some capsicum strips and onion slices and top with mozzarella cheese. Place olives, capsicum strips and onion slices once again. Cook on low heat till cheese melts.