Take a bowl and add chickpea flour/Besan to it. Start adding water little at a time and stir with a whisk so that there are no lumps. Make a smooth batter and add salt, red chili powder & Garam masala. Stir and set aside.
Tend to your bread slices now. Cut the side crust of the slices and then halve the slices. You will end up with 8-12 bread slices now, depending upon the bread you are using.
Heat the Tawa or griddle to high and gently wipe it with a paper towel dipped in oil for greasing evenly. I used electric griddle. You may use over the stove or electric griddle, whatever is handy.
Now take a slice of bread and gently dip in the Besan batter. Place it carefully on hot Tawa. Add the garnish of finely chopped onions, chili and coriander leaves on the top of the slice.
Let the Besan Toast cook from the bottom on medium to high heat for about 1&1/2 to 2 minutes, till it is cooked and slightly golden.
Now carefully flip it with a flat spatula, the garnish side facing down now. Press it down with the spatula and cook for another 1&1/2 to 2 minutes till it is golden and onions are cooked.
Your Besan Toast is ready to be served warm.
If you are using a big Tawa, then you may make 3-4 besan toast at a time.