Heat oil in a pan. Add mustard and jeera. Let them splutter.
Add green chilies, onion, capsicum, grated carrots, and saute well until onion and bell peppers become soft.
Next, add deseeded tomatoes, saute for a few seconds until the tomato turns soft.
Add jeera powder, chaat masala or (garam masala), red chili powder, and stir well for another minute.
Add salt, coriander leaves, tomato ketchup, and mix well. Turn off the flame. The topping for masala bread toast is now ready.
Grease a tawa and heat it over a medium flame. Spread butter or ghee on both the sides of the bread piece and place on the tawa.
Cook on a medium flame for a few seconds and then flip to the other side. Cook on both sides till they become golden brown and crisp.
Place the prepared bread toast on a serving plate.
Spread two tablespoons of prepared topping over the bread slices and serve Iyengar bakery-style vegetable masala toast hot with a cup of tea/coffee.