Preheat the oven to 200 degree Celsius and line the baking tray with foil. In a mixing bowl, add chopped onion, bell pepper and tomato. Give it a mix.
Add chopped green chillies, lemon juice and salt. Mix everything together.
Take the kidney beans in a separate bowl and mix in tomato ketchup. Season it with some salt and give it a quick mix.
On the baking tray, arrange the tortilla chips or nachos in a single layer.
Top the chips with the kidney bean mixture.
Sprinkle with the chopped veggies.
Add the grated mozzarella cheese on top.
Bake for 5-6 minutes or until the cheese melts. Serve hot with yoghurt dip and salsa.