Heat a pan and melt the butter. Add in the maida and stir for a minute on low flame.
Add the veggies and half a bowl of water to cook. You can skip this step if you're not using cabbage.
Pour in the milk and cook for another 5-6 minutes. When it thickens, add cheese, salt and pepper. Turn off the gas as soon as you add cheese. Your vegetarian mayonnaise is ready to be used.
Preheat the oven to 170 degrees. Cut the edges from the bread slices. Flatten each slice with a rolling pin and spread peanut butter on it. Then spread 1 spoonful of white sauce on top of the peanut butter.
Roll the bread carefully. Put some cheese along the seam and bake it for 5 minutes.
You can serve these rolls as they are or cut them into bites. Serve with some more homemade mayo or tomato sauce.