Thinly slice the capsicum and onion. If the slice is too long, cut the slices in between. As for paneer, cut it into small cubes, so the stuffing is even spread on the bread. Also, shred the mozzarella and let it rest.
Take a bowl, and mix mint mayonnaise, white mayonnaise, red chili sauce, tomato ketchup, red chili flakes, and oregano.
Add paneer, onion, corn, cheese, and capsicum to the sauce, and toss them till they are nicely coated.
Now spread the white mayonnaise evenly on one side of both the slices of bread that are going to be grilled.
On the opposite sides of the slices, stuff the filling in between them.
Heat the griddle, and place the sandwich on it. Grill it on medium flame. Remember to check the slices if they are properly grilled or not.
Place it on a plate, and split the paneer corn sandwich diagonally, and enjoy.