Roughly chop broccoli florets and transfer in a bowl.
Coarsely crush corn kernels in a grinder and add to the broccoli. Mix well. Add sweet potato and mix. Add salt and garam masala powder and mix well.
Spread breadcrumbs on a plate.
Divide the prepared mixture into equal portions and shape them into small size tikkis.
Heat some oil in a non-stick pan. Place the tikkis in it and shallow-fry till golden from both the sides.
Slice pita breads horizontally into halves and toast lightly in the same pan.
Cut cheese slices into four squares.
Place a lower half of the toasted pita bread on the worktop. Top with a torn lettuce leaf followed by a tikki, a tomato slice and a cheese square. Cover with the other toasted bread half and secure with a toothpick. Similarly prepare the rest.