Soak the mixed beans overnight and pressure-cook (up to 3 whistles) with enough salt and water. Drain the cooked water and keep the cooked beans aside.
Pour the cooked beans in a large bowl, add the chopped onions, green chillies, garam masala powder, amchur powder, ginger-garlic paste, coriander leaves, corn flour, rice flour and salt. Mash everything well.
Make medium-sized oblong kebabs and shallow-fry them in enough oil.
In the meantime, mix the yogurt, pepper powder and salt and keep aside.
Heat the tortillas in a hot pan until they turn warm. Take off from the pan and spread yogurt sauce as per need.
Place the fried mixed beans kebabs over the spread, arrange a few tomato slices and fold them as wrap. Serve immediately